Compare 639638 vs 639647
| Property | 639638 | 639647 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 21 × 3198191 | 6396471 |
| Prime factorization | 2 × 319819 | 639647 |
| Divisors count | 4 | 2 |
| Divisors | 1, 2, 319819, 639638 | 1, 639647 |
| Number of properties | 1 | 4 |
| Centered heptagonal primes | 87th | |
| Chen primes | 20362nd | |
| Isolated primes | 40794th | |
| Primes | 52049th | |
| Semiprimes | 137063rd | |
| Roman numberals | ||
| Base 2 | 100111000010100101102 | 100111000010100111112 |
| Base 3 | 10121111020223 | 10121111021223 |
| Base 4 | 21300221124 | 21300221334 |
| Base 5 | 1304320235 | 1304320425 |
| Base 6 | 214131426 | 214131556 |
| Base 7 | 53025567 | 53026017 |
| Base 8 | 23412268 | 23412378 |
| Base 9 | 11743689 | 11743789 |
| Base 10 | 63963810 | 63964710 |
| Base 11 | 3a762a11 | 3a763811 |
| Base 12 | 26a1b212 | 26a1bb12 |
| Base 13 | 1951ac13 | 1951b813 |
| Base 14 | 12916614 | 12917114 |
| Base 15 | c97c815 | c97d215 |
| Base 16 | 9c29616 | 9c29f16 |