138 (number)
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| Cardinal | one hundred thirty-eight | |||
| Ordinal | 138th (one hundred thirty-eighth) |
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| Factorization | 2 × 3 × 23 | |||
| Divisors | 1, 2, 3, 6, 23, 46, 69, 138 | |||
| Roman numeral | CXXXVIII | |||
| Binary | 100010102 | |||
| Ternary | 120103 | |||
| Quaternary | 20224 | |||
| Quinary | 10235 | |||
| Senary | 3506 | |||
| Octal | 2128 | |||
| Duodecimal | B612 | |||
| Hexadecimal | 8A16 | |||
| Vigesimal | 6I20 | |||
| Base 36 | 3U36 | |||
138 (one hundred [and] thirty-eight) is the natural number following 137 and preceding 139.
138 is a sphenic number, the sum of four consecutive primes (29 + 31 + 37 + 41), and the smallest product of 3 primes, such that in base 10, the third prime is a concatenation of the other two: .
138 is the third 47-gonal number and an Ulam number, as well as a 1 step palindrome (138 + 831 = 969.)
138 is the 72nd normal Congruent number and the 49th primitive or square free congruent number.
138 is also:
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Wikipedia