Compare 1638 vs 1642
| Property | 1638 | 1642 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 4 | 2 |
| Total factors | 5 | 2 |
| Prime factorization | 21 × 32 × 71 × 131 | 21 × 8211 |
| Prime factorization | 2 × 3 × 3 × 7 × 13 | 2 × 821 |
| 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, 2, 821, 1642 |
| Number of properties | 0 | 1 |
| Semiprimes | 471st | |
| Roman numberals | MDCXXXVIII | MDCXLII |
| Base 2 | 110011001102 | 110011010102 |
| Base 3 | 20202003 | 20202113 |
| Base 4 | 1212124 | 1212224 |
| Base 5 | 230235 | 230325 |
| Base 6 | 113306 | 113346 |
| Base 7 | 45307 | 45347 |
| Base 8 | 31468 | 31528 |
| Base 9 | 22209 | 22249 |
| Base 10 | 163810 | 164210 |
| Base 11 | 125a11 | 126311 |
| Base 12 | b4612 | b4a12 |
| Base 13 | 99013 | 99413 |
| Base 14 | 85014 | 85414 |
| Base 15 | 74315 | 74715 |
| Base 16 | 66616 | 66a16 |