Compare 1640 vs 1643
| Property | 1640 | 1643 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 5 | 2 |
| Prime factorization | 23 × 51 × 411 | 311 × 531 |
| Prime factorization | 2 × 2 × 2 × 5 × 41 | 31 × 53 |
| Divisors count | 16 | 4 |
| Divisors | 1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640 | 1, 31, 53, 1643 |
| Number of properties | 0 | 1 |
| Semiprimes | 472nd | |
| Roman numberals | MDCXL | MDCXLIII |
| Base 2 | 110011010002 | 110011010112 |
| Base 3 | 20202023 | 20202123 |
| Base 4 | 1212204 | 1212234 |
| Base 5 | 230305 | 230335 |
| Base 6 | 113326 | 113356 |
| Base 7 | 45327 | 45357 |
| Base 8 | 31508 | 31538 |
| Base 9 | 22229 | 22259 |
| Base 10 | 164010 | 164310 |
| Base 11 | 126111 | 126411 |
| Base 12 | b4812 | b4b12 |
| Base 13 | 99213 | 99513 |
| Base 14 | 85214 | 85514 |
| Base 15 | 74515 | 74815 |
| Base 16 | 66816 | 66b16 |