Compare 138 vs 139
| Property | 138 | 139 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 21 × 31 × 231 | 1391 |
| Prime factorization | 2 × 3 × 23 | 139 |
| Divisors count | 8 | 2 |
| Divisors | 1, 2, 3, 6, 23, 46, 69, 138 | 1, 139 |
| Number of properties | 0 | 6 |
| Additive primes | 19th | |
| Chen primes | 28th | |
| Happy primes | 10th | |
| Harmonic primes | 11th | |
| Primes | 34th | |
| Twin primes (2nd member) | 11th | |
| Roman numberals | CXXXVIII | CXXXIX |
| Base 2 | 100010102 | 100010112 |
| Base 3 | 120103 | 120113 |
| Base 4 | 20224 | 20234 |
| Base 5 | 10235 | 10245 |
| Base 6 | 3506 | 3516 |
| Base 7 | 2557 | 2567 |
| Base 8 | 2128 | 2138 |
| Base 9 | 1639 | 1649 |
| Base 10 | 13810 | 13910 |
| Base 11 | 11611 | 11711 |
| Base 12 | b612 | b712 |
| Base 13 | a813 | a913 |
| Base 14 | 9c14 | 9d14 |
| Base 15 | 9315 | 9415 |
| Base 16 | 8a16 | 8b16 |