Compare 1387 vs 1399
| Property | 1387 | 1399 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 191 × 731 | 13991 |
| Prime factorization | 19 × 73 | 1399 |
| Divisors count | 4 | 2 |
| Divisors | 1, 19, 73, 1387 | 1, 1399 |
| Number of properties | 1 | 6 |
| Chen primes | 145th | |
| Emirps | 65th | |
| Good primes | 52nd | |
| Harmonic primes | 76th | |
| Isolated primes | 131st | |
| Primes | 222nd | |
| Semiprimes | 410th | |
| Roman numberals | MCCCLXXXVII | MCCCXCIX |
| Base 2 | 101011010112 | 101011101112 |
| Base 3 | 12201013 | 12202113 |
| Base 4 | 1112234 | 1113134 |
| Base 5 | 210225 | 210445 |
| Base 6 | 102316 | 102516 |
| Base 7 | 40217 | 40367 |
| Base 8 | 25538 | 25678 |
| Base 9 | 18119 | 18249 |
| Base 10 | 138710 | 139910 |
| Base 11 | 105111 | 106211 |
| Base 12 | 97712 | 98712 |
| Base 13 | 82913 | 83813 |
| Base 14 | 71114 | 71d14 |
| Base 15 | 62715 | 63415 |
| Base 16 | 56b16 | 57716 |