Compare 639986 vs 640031
| Property | 639986 | 640031 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 21 × 3199931 | 71 × 914331 |
| Prime factorization | 2 × 319993 | 7 × 91433 |
| Divisors count | 4 | 4 |
| Divisors | 1, 2, 319993, 639986 | 1, 7, 91433, 640031 |
| Number of properties | 1 | 1 |
| Semiprimes | 137144th | 137150th |
| Roman numberals | ||
| Base 2 | 100111000011111100102 | 100111000100000111112 |
| Base 3 | 10121112200123 | 10121112212123 |
| Base 4 | 21300333024 | 21301001334 |
| Base 5 | 1304344215 | 1304401115 |
| Base 6 | 214145226 | 214150356 |
| Base 7 | 53035647 | 53036607 |
| Base 8 | 23417628 | 23420378 |
| Base 9 | 11748059 | 11748559 |
| Base 10 | 63998610 | 64003110 |
| Base 11 | 3a791611 | 3a795711 |
| Base 12 | 26a44212 | 26a47b12 |
| Base 13 | 1953b913 | 19542213 |
| Base 14 | 12933414 | 12936714 |
| Base 15 | c995b15 | c998b15 |
| Base 16 | 9c3f216 | 9c41f16 |