Compare 1638 vs 1643
| Property | 1638 | 1643 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 4 | 2 |
| Total factors | 5 | 2 |
| Prime factorization | 21 × 32 × 71 × 131 | 311 × 531 |
| Prime factorization | 2 × 3 × 3 × 7 × 13 | 31 × 53 |
| 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, 31, 53, 1643 |
| Number of properties | 0 | 1 |
| Semiprimes | 472nd | |
| Roman numberals | MDCXXXVIII | MDCXLIII |
| Base 2 | 110011001102 | 110011010112 |
| Base 3 | 20202003 | 20202123 |
| Base 4 | 1212124 | 1212234 |
| Base 5 | 230235 | 230335 |
| Base 6 | 113306 | 113356 |
| Base 7 | 45307 | 45357 |
| Base 8 | 31468 | 31538 |
| Base 9 | 22209 | 22259 |
| Base 10 | 163810 | 164310 |
| Base 11 | 125a11 | 126411 |
| Base 12 | b4612 | b4b12 |
| Base 13 | 99013 | 99513 |
| Base 14 | 85014 | 85514 |
| Base 15 | 74315 | 74815 |
| Base 16 | 66616 | 66b16 |