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|---|---|---|---|---|
| Cardinal | forty thousand | |||
| Ordinal | 40000th (forty thousandth) |
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| Factorization | 26× 54 | |||
| Roman numeral | XL | |||
| Binary | 10011100010000002 | |||
| Ternary | 20002121113 | |||
| Quaternary | 213010004 | |||
| Quinary | 22400005 | |||
| Senary | 5051046 | |||
| Octal | 1161008 | |||
| Duodecimal | 1B19412 | |||
| Hexadecimal | 9C4016 | |||
| Vigesimal | 500020 | |||
| Base 36 | UV436 | |||
40,000 (forty thousand) is the natural number that comes after 39,999 and before 40,001. It is the square of 200.