Compare 1638 vs 1649
| Property | 1638 | 1649 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 4 | 2 |
| Total factors | 5 | 2 |
| Prime factorization | 21 × 32 × 71 × 131 | 171 × 971 |
| Prime factorization | 2 × 3 × 3 × 7 × 13 | 17 × 97 |
| Divisors count | 24 | 4 |
| Divisors | 1, 2, 3, 6, 7, 9, 13, 14, 18, 21, 26, 39, 42, 63, 78, 91, 117, 126, 182, 234, 273, 546, 819, 1638 | 1, 17, 97, 1649 |
| Number of properties | 0 | 1 |
| Semiprimes | 474th | |
| Roman numberals | MDCXXXVIII | MDCXLIX |
| Base 2 | 110011001102 | 110011100012 |
| Base 3 | 20202003 | 20210023 |
| Base 4 | 1212124 | 1213014 |
| Base 5 | 230235 | 230445 |
| Base 6 | 113306 | 113456 |
| Base 7 | 45307 | 45447 |
| Base 8 | 31468 | 31618 |
| Base 9 | 22209 | 22329 |
| Base 10 | 163810 | 164910 |
| Base 11 | 125a11 | 126a11 |
| Base 12 | b4612 | b5512 |
| Base 13 | 99013 | 99b13 |
| Base 14 | 85014 | 85b14 |
| Base 15 | 74315 | 74e15 |
| Base 16 | 66616 | 67116 |