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Natural number From Wikipedia, the free encyclopedia
239 (two hundred [and] thirty-nine) is the natural number following 238 and preceding 240.
| ||||
---|---|---|---|---|
Cardinal | two hundred thirty-nine | |||
Ordinal | 239th (two hundred thirty-ninth) | |||
Factorization | prime | |||
Prime | yes | |||
Greek numeral | ΣΛΘ´ | |||
Roman numeral | CCXXXIX | |||
Binary | 111011112 | |||
Ternary | 222123 | |||
Senary | 10356 | |||
Octal | 3578 | |||
Duodecimal | 17B12 | |||
Hexadecimal | EF16 |
239 is a prime number. The next is 241, with which it forms a pair of twin primes; hence, it is also a Chen prime. 239 is a Sophie Germain prime and a Newman–Shanks–Williams prime.[1] It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1 (with no exponentiation implied). 239 is also a happy number.
239 is the smallest positive integer d such that the imaginary quadratic field Q(√−d) has class number = 15.[2]
HAKMEM (incidentally AI memo 239 of the MIT AI Lab) included an item on the properties of 239, including these:[3]
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