290 (number)
Natural number
From Wikipedia, the free encyclopedia
290 (two hundred [and] ninety) is the natural number following 289 and preceding 291.
| ||||
|---|---|---|---|---|
| Cardinal | two hundred ninety | |||
| Ordinal | 290th (two hundred ninetieth) | |||
| Factorization | 2 × 5 × 29 | |||
| Greek numeral | ΣϞ´ | |||
| Roman numeral | CCXC, ccxc | |||
| Binary | 1001000102 | |||
| Ternary | 1012023 | |||
| Senary | 12026 | |||
| Octal | 4428 | |||
| Duodecimal | 20212 | |||
| Hexadecimal | 12216 | |||
In mathematics
The product of three primes, 290 is a sphenic number,[1] and the sum of four consecutive primes (67 + 71 + 73 + 79). The sum of the squares of the divisors of 17 is 290.
Not only is it a nontotient[2] and a noncototient,[3] it is also an untouchable number.[4]
290 is the 16th member of the Mian–Chowla sequence; it can not be obtained as the sum of any two previous terms in the sequence.[5]
See also the Bhargava–Hanke 290 theorem.