1000 (number)
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| Cardinal | One thousand | ||
| Ordinal | 1000th | ||
| Factorization | <math>2^3 \cdot 5^3<math> | ||
| Roman numeral | M (mille) | ||
| Unicode representation of Roman numeral | Ⅿ, ⅿ, ↀ | ||
| prefixes | chilia- (from Greek) | ||
| Binary | 1111101000 | ||
| Hexadecimal | 3E8 | ||
1000 is the natural number following 999 and preceding 1001.
In scientific notation, one thousand is written as 103. The SI prefix for a thousand is "kilo-".
Thousand (single) is a techno single by Moby.
See also: millennium, year 1000 AD
| Contents |
Selected numbers in the thousands (1001-1999)
1001-1249
- 1001 - sphenic number, pentagonal number, pentatope number
- 1002 - sphenic number, Mertens function zero
- 1005 - Mertens function zero
- 1008 - divisible by the number of primes below it
- 1010 - Mertens function zero
- 1013 - Sophie Germain prime, centered square number, Mertens function zero
- 1014 - Mertens function zero
- 1015 - square pyramidal number
- 1018 - Mertens function zero
- 1019 - Sophie Germain prime, safe prime
- 1023 - is the highest number one can count to on one's fingers using binary
- 1024 - power of two, 32^2; in common use, the amount of bytes in a kilobyte (in 1999, the IEC coined kibibyte to use for 1024 with kilobyte being 1000, but this convention has not been widely adopted)
- 1027 - sum of the squares of the first eight primes
- 1031 - Sophie Germain prime
- 1035 - triangular number, hexagonal number
- 1049 - Sophie Germain prime, highly cototient number
- 1051 - centered pentagonal number
- 1056 - pronic number
- 1060 - sum of the first 25 primes
- 1071 - heptagonal number
- 1072 - centered heptagonal number
- 1079 - Every positive integer is the sum of at most 1079 tenth powers.
- 1080 - pentagonal number
- 1081 - triangular number
- 1086 - Smith number
- 1089 - 33^2, nonagonal number, centered octagonal number
- 1092- divisible by the number of primes below it
- 1093 - star number
- 1103 - Sophie Germain prime
- 1104 - Keith number
- 1105 - Carmichael number, magic constant of n × n magic square and n-Queens Problem for n = 13, decagonal number, centered square number
- 1116 - divisible by the number of primes below it
- 1122 - pronic number, divisible by the number of primes below it
- 1128 - triangular number, hexagonal number, divisible by the number of primes below it
- 1134- divisible by the number of primes below it
- 1138 - special code for Easter eggs on Star Wars DVDs, because of George Lucas's movie THX-1138
- 1140 - tetrahedral number
- 1152 - highly totient number
- 1156 - 34^2, octahedral number, centered pentagonal number
- 1161 - sum of the first 26 primes
- 1162 - pentagonal number
- 1169 - highly cototient number
- 1176 - triangular number
- 1177 - heptagonal number
- 1184 - amicable number with 1210
- 1187 - safe prime
- 1190 - pronic number
- 1198 - centered heptagonal number
- 1201 - centered square number
- 1210 - amicable number with 1184
- 1216 - nonagonal number
- 1219 - Mertens function zero
- 1220 - Mertens function zero
- 1223 - Sophie Germain prime
- 1225 - triangular number, 35^2, triangular square number, hexagonal number, centered octagonal number
- 1229 - Sophie Germain prime
- 1233 - 12^2 + 33^2
- 1240 - square pyramidal number
- 1241 - centered cube number
- 1242 - decagonal number
- 1247 - pentagonal number
1250-1499
- 1255 - Mertens function zero
- 1256 - Mertens function zero
- 1258 - Mertens function zero
- 1259 - highly cototient number
- 1260 - highly composite number, pronic number, vampire number
- 1261 - star number, Mertens function zero
- 1264 - sum of the first 27 primes
- 1266 - centered pentagonal number, Mertens function zero
- 1270 - Mertens function zero
- 1279 - Mertens function zero
- 1280 - Mertens function zero
- 1282 - Mertens function zero
- 1283 - safe prime
- 1285 - Mertens function zero
- 1288 - heptagonal number
- 1289 - Sophie Germain prime, Mertens function zero
- 1291 - Mertens function zero
- 1292 - Mertens function zero
- 1296 - 36^2, fourth power of 6, sum of the cubes of the first eight positive integers
- 1297 - Mertens function zero
- 1299 - Mertens function zero
- 1300 - Mertens function zero
- 1301 - centered square number
- 1302 - Mertens function zero
- 1306 - Mertens function zero
- 1307 - safe prime
- 1318 - Mertens function zero
- 1319 - safe prime
- 1326 - triangular number, hexagonal number, Mertens function zero
- 1329 - Mertens function zero
- 1330 - tetrahedral number
- 1331 - cube of 11, centered heptagonal number
- 1332 - pronic number
- 1335 - pentagonal number, Mertens function zero
- 1336 - Mertens function zero
- 1337 - Used in the novel form of spelling called leet
- 1338 - Mertens function zero
- 1342 - Mertens function zero
- 1350 - nonagonal number
- 1365 - pentatope number
- 1367 - safe prime
- 1369 - 37^2, centered octagonal number
- 1371 - sum of the first 28 primes
- 1378 - triangular number
- 1379 - magic constant of n × n magic square and n-Queens Problem for n = 14.
- 1381 - centered pentagonal number
- 1387 - super-Poulet number, decagonal number
- 1395 - vampire number
- 1404 - heptagonal number
- 1405 = 26^2 + 27^2 = 7^2 + 8^2 + ... + 16^2, centered square number
- 1406 - pronic number, semi-meandric number
- 1409 - Sophie Germain prime
- 1419 - Zeisel number
- 1425 - self-descriptive number in base 5
- 1426 - pentagonal number
- 1431 - triangular number, hexagonal number
- 1435 - vampire number; the standard railway gauge in millimetres, equivalent to 4' 81"
- 1439 - Sophie Germain prime, safe prime
- 1440 - a highly totient number, square pyramidal number and a 481-gonal number. Also, the number of minutes in one day, and the blocksize of a standard 3,5" floppy disk
- 1441 - star number
- 1444 - 38^2, smallest pandigital number in Roman numerals
- 1451 - Sophie Germain prime
- 1469 - octahedral number, highly cototient number
- 1470 - pentagonal pyramidal number
- 1471 - centered heptagonal number
- 1480 - sum of the first 29 primes
- 1481 - Sophie Germain prime
- 1482 - pronic number
- 1485 - triangular number
- 1487 - safe prime
- 1490 - tetranacci number
- 1491 - nonagonal number, Mertens function zero
- 1492 - Mertens function zero
- 1496 - square pyramidal number
- 1499 - Sophie Germain prime
1500-1749
- 1501 - centered pentagonal number
- 1511 - Sophie Germain prime
- 1513 - centered square number
- 1518 - Mertens function zero
- 1519 - Mertens function zero
- 1520 - pentagonal number, Mertens function zero
- 1521 - Mertens function zero, 39^2, centered octagonal number
- 1523 - Mertens function zero, safe prime
- 1524 - Mertens function zero
- 1525 - heptagonal number, Mertens function zero
- 1527 - Mertens function zero
- 1528 - Mertens function zero
- 1530 - vampire number
- 1531 - Mertens function zero
- 1532 - Mertens function zero
- 1537 - Keith number, Mertens function zero
- 1540 - triangular number, hexagonal number, decagonal number, tetrahedral number
- 1543 - Mertens function zero
- 1544 - Mertens function zero
- 1546 - Mertens function zero
- 1556 - sum of the squares of the first nine primes
- 1559 - Sophie Germain prime
- 1560 - pronic number
- 1575 - odd abundant number
- 1583 - Sophie Germain prime
- 1593 - sum of the first 30 primes
- 1596 - triangular number
- 1597 - Fibonacci number
- 1600 - 40^2, street number on Pennsylvania avenue of the White House, perfect score on SAT tests administered prior to 2005
- 1601 - Sophie Germain prime, the novel 1601 (Mark Twain)
- 1616 - the year Shakespeare died
- 1617 - pentagonal number
- 1618 - centered heptagonal number
- 1619 - safe prime
- 1625 - centered square number
- 1626 - centered pentagonal number
- 1633 - star number
- 1638 - harmonic divisor number
- 1639 - nonagonal number
- 1640 - pronic number
- 1649 - highly cototient number
- 1651 - heptagonal number
- 1653 - triangular number, hexagonal number
- 1657 - cuban prime
- 1666 - largest efficient pandigital number in Roman numerals (each symbol occurs exactly once)
- 1679 - highly cototient number
- 1680 - highly composite number
- 1681 - 41^2, smallest number yielded by the formula n^2 + n + 41 that is not a prime; centered octagonal number
- 1695 - magic constant of n × n magic square and n-Queens Problem for n = 15.
- 1701 - decagonal number, hull number of the Starship Enterprise on Star Trek
- 1705 - tribonacci number
- 1711 - triangular number
- 1717 - pentagonal number
- 1720 - sum of the first 31 primes
- 1722 - Giuga number, pronic number
- 1728 - cube of 12 and so is the number of cubic inches in a cubic foot
- 1729 - taxicab number, Carmichael number, Zeisel number, centered cube number. In the decimal expansion of e the first time all 10 digits appear in sequence starts at the 1729th decimal place. In 1979 the rock musical Hair closed on Broadway in New York City after 1729 performances.
- 1733 - Sophie Germain prime
- 1741 - centered square number
1750-1999
- 1756 - centered pentagonal number
- 1764 - 42^2
- 1770 - triangular number, hexagonal number, Town of Seventeen Seventy in Australia
- 1771 - tetrahedral number
- 1772 - centered heptagonal number
- 1782 - heptagonal number
- 1785 - square pyramidal number
- 1791 - largest natural number that cannot be expressed as a sum of at most four hexagonal numbers.
- 1794 - nonagonal number
- 1800 - pentagonal pyramidal number, also, in da Ponte's Don Giovanni, the number of women Don Giovanni had slept with so far when confronted by Donna Elvira, according to Leporello's tally
- 1801 - cuban prime
- 1806 - pronic number
- 1811 - Sophie Germain prime
- 1820 - pentagonal number, pentatope number
- 1823 - safe prime
- 1827 - vampire number
- 1828 - meandric number, open meandric number
- 1830 - triangular number
- 1834 - octahedral number, sum of the cubes of the first five primes
- 1836 - factor by which a proton is more massive than an electron
- 1837 - star number
- 1841 - Mertens function zero
- 1843 - Mertens function zero
- 1844 - Mertens function zero
- 1845 - Mertens function zero
- 1849 - 43^2, centered octagonal number
- 1851 - sum of the first 32 primes
- 1853 - Mertens function zero
- 1854 - Mertens function zero
- 1857 - Mertens function zero
- 1861 - centered square number, Mertens function zero
- 1862 - Mertens function zero
- 1863 - Mertens function zero
- 1864 - Mertens function zero
- 1866 - Mertens function zero
- 1870 - decagonal number
- 1885 - Zeisel number
- 1889 - Sophie Germain prime, highly cototient number
- 1891 - triangular number, hexagonal number, centered pentagonal number
- 1892 - pronic number
- 1900 - 1900 or Novecento is a 1977 movie
- 1901 - Sophie Germain prime
- 1907 - safe prime
- 1918 - heptagonal number
- 1926 - pentagonal number
- 1929 - Mertens function zero
- 1931 - Sophie Germain prime
- 1933 - centered heptagonal number
- 1936 - 44^2
- 1938 - Mertens function zero
- 1951 - cuban prime
- 1953 - triangular number
- 1956 - nonagonal number
- 1969 - the movie 1969 (movie)
- 1973 - Sophie Germain prime
- 1980 - pronic number
- 1984 - see 1984 (number)
- 1985 - centered square number
- 1988 - sum of the first 33 primesda:Tusind
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