Compare 1638 vs 1640
| Property | 1638 | 1640 |
|---|---|---|
| Type | composite number | composite number |
| Unique factors | 4 | 3 |
| Total factors | 5 | 5 |
| Prime factorization | 21 × 32 × 71 × 131 | 23 × 51 × 411 |
| Prime factorization | 2 × 3 × 3 × 7 × 13 | 2 × 2 × 2 × 5 × 41 |
| Divisors count | 24 | 16 |
| 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, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640 |
| Number of properties | 0 | 0 |
| Roman numberals | MDCXXXVIII | MDCXL |
| Base 2 | 110011001102 | 110011010002 |
| Base 3 | 20202003 | 20202023 |
| Base 4 | 1212124 | 1212204 |
| Base 5 | 230235 | 230305 |
| Base 6 | 113306 | 113326 |
| Base 7 | 45307 | 45327 |
| Base 8 | 31468 | 31508 |
| Base 9 | 22209 | 22229 |
| Base 10 | 163810 | 164010 |
| Base 11 | 125a11 | 126111 |
| Base 12 | b4612 | b4812 |
| Base 13 | 99013 | 99213 |
| Base 14 | 85014 | 85214 |
| Base 15 | 74315 | 74515 |
| Base 16 | 66616 | 66816 |