Compare 391 vs 407
| Property | 391 | 407 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 171 × 231 | 111 × 371 |
| Prime factorization | 17 × 23 | 11 × 37 |
| Divisors count | 4 | 4 |
| Divisors | 1, 17, 23, 391 | 1, 11, 37, 407 |
| Number of properties | 1 | 1 |
| Semiprimes | 122nd | 128th |
| Roman numberals | CCCXCI | CDVII |
| Base 2 | 1100001112 | 1100101112 |
| Base 3 | 1121113 | 1200023 |
| Base 4 | 120134 | 121134 |
| Base 5 | 30315 | 31125 |
| Base 6 | 14516 | 15156 |
| Base 7 | 10667 | 11217 |
| Base 8 | 6078 | 6278 |
| Base 9 | 4749 | 5029 |
| Base 10 | 39110 | 40710 |
| Base 11 | 32611 | 34011 |
| Base 12 | 28712 | 29b12 |
| Base 13 | 24113 | 25413 |
| Base 14 | 1dd14 | 21114 |
| Base 15 | 1b115 | 1c215 |
| Base 16 | 18716 | 19716 |