Compare 1638 vs 1639
| Property | 1638 | 1639 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 4 | 2 |
| Total factors | 5 | 2 |
| Prime factorization | 21 × 32 × 71 × 131 | 111 × 1491 |
| Prime factorization | 2 × 3 × 3 × 7 × 13 | 11 × 149 |
| 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, 11, 149, 1639 |
| Number of properties | 0 | 1 |
| Semiprimes | 469th | |
| Roman numberals | MDCXXXVIII | MDCXXXIX |
| Base 2 | 110011001102 | 110011001112 |
| Base 3 | 20202003 | 20202013 |
| Base 4 | 1212124 | 1212134 |
| Base 5 | 230235 | 230245 |
| Base 6 | 113306 | 113316 |
| Base 7 | 45307 | 45317 |
| Base 8 | 31468 | 31478 |
| Base 9 | 22209 | 22219 |
| Base 10 | 163810 | 163910 |
| Base 11 | 125a11 | 126011 |
| Base 12 | b4612 | b4712 |
| Base 13 | 99013 | 99113 |
| Base 14 | 85014 | 85114 |
| Base 15 | 74315 | 74415 |
| Base 16 | 66616 | 66716 |