1000 (number)

1000 is the natural number following 999 and preceding 1001.

List of numbers — Integers

<< 1k 2k 3k 4k 5k 6k 7k 8k 9k >>

Cardinal One thousand
Ordinal 1000th
Factorization
Roman numeral M
Binary 1111101000
Hexadecimal 3E8

In scientific notation, one thousand is written as 10³. The SI prefix for a thousand is "kilo-".

The Roman numeral for thousand is M (for mille).

Selected numbers in the thousands (1000-1999)

;1001 - sphenic number, pentagonal number ;1002 - sphenic number ;1013 - Sophie Germain prime ;1015 - square pyramidal number ;1019 - Sophie Germain prime ;1024 - power of two ;1031 - Sophie Germain prime ;1035 - triangular number, hexagonal number ;1049 - Sophie Germain prime ;1060 - sum of the first 25 primes ;1071 - heptagonal number ;1080 - pentagonal number ;1081 - triangular number ;1103 - Sophie Germain prime ;1104 - Keith number ;1105 - Carmichael number, magic constant of nxn magic square and n-Queens Problem for n = 13. ;1128 - triangular number, hexagonal number ;1138 - special code for Easter eggs on Star Wars DVDs, because of George Lucas's movie THX-1138 ;1156 - octahedral number ;1161 - sum of the first 26 primes ;1162 - pentagonal number ;1176 - triangular number ;1177 - heptagonal number ;1184 - amicable number with 1210 ;1210 - amicable number with 1184 ;1223 - Sophie Germain prime ;1225 - triangular number, triangular square number, hexagonal number ;1229 - Sophie Germain prime ;1240 - square pyramidal number ;1247 - pentagonal number ;1260 - highly composite number ;1264 - sum of the first 27 primes ;1288 - heptagonal number ;1289 - Sophie Germain prime ;1326 - triangular number, hexagonal number ;1335 - pentagonal number ;1371 - sum of the first 28 primes ;1378 - triangular number ;1379 - magic constant of nxn magic square and n-Queens Problem for n = 14. ;1404 - heptagonal number ;1405 = 26^2 + 27^2 = 7^2 + 8^2 + ... + 16^2 ;1409 - Sophie Germain prime ;1419 - Zeisel number ;1426 - pentagonal number ;1431 - triangular number, hexagonal number ;1439 - Sophie Germain prime ;1451 - Sophie Germain prime ;1469 - octahedral number ;1470 - pentagonal pyramidal number ;1480 - sum of the first 29 primes ;1481 - Sophie Germain prime ;1485 - triangular number ;1490 - tetranacci number ;1496 - square pyramidal number ;1499 - Sophie Germain prime ;1511 - Sophie Germain prime ;1520 - pentagonal number ;1525 - heptagonal number ;1537 - Keith number ;1540 - triangular number, hexagonal number ;1559 - Sophie Germain prime ;1583 - Sophie Germain prime ;1593 - sum of the first 30 primes ;1596 - triangular number ;1597 - Fibonacci number ;1601 - Sophie Germain prime ;1617 - pentagonal number ;1638 - harmonic divisor number ;1651 - heptagonal number ;1653 - triangular number, hexagonal number ;1657 - cuban prime ;1680 - highly composite number ;1695 - magic constant of nxn magic square and n-Queens Problem for n = 15. ;1701 - 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 ;1729 - taxicab number, Carmichael number, Zeisel number. In the decimal expansion of e , the first time all 10 digits appear in sequence starts at the 1729th decimal place. Trivia: In 1979 the rock musical Hair closed on Broadway in New York City after 1729 performances. ;1733 - Sophie Germain prime ;1770 - triangular number, hexagonal number, Town of Seventeen Seventy in Australia ;1782 - heptagonal number ;1785 - square pyramidal number ;1800 - pentagonal pyramidal number ;1801 - cuban prime ;1811 - Sophie Germain prime ;1820 - pentagonal number ;1830 - triangular number ;1834 - octahedral number ;1851 - sum of the first 32 primes ;1885 - Zeisel number ;1889 - Sophie Germain prime ;1891 - triangular number, hexagonal number ;1901 - Sophie Germain prime ;1918 - heptagonal number ;1926 - pentagonal number ;1931 - Sophie Germain prime ;1951 - cuban prime ;1953 - triangular number ;1973 - Sophie Germain prime ;1984 - the novel Nineteen Eighty-Four ;1988 - sum of the first 33 primes