Compare 391 vs 399
| Property | 391 | 399 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 3 |
| Total factors | 2 | 3 |
| Prime factorization | 171 × 231 | 31 × 71 × 191 |
| Prime factorization | 17 × 23 | 3 × 7 × 19 |
| Divisors count | 4 | 8 |
| Divisors | 1, 17, 23, 391 | 1, 3, 7, 19, 21, 57, 133, 399 |
| Number of properties | 1 | 0 |
| Semiprimes | 122nd | |
| Roman numberals | CCCXCI | CCCXCIX |
| Base 2 | 1100001112 | 1100011112 |
| Base 3 | 1121113 | 1122103 |
| Base 4 | 120134 | 120334 |
| Base 5 | 30315 | 30445 |
| Base 6 | 14516 | 15036 |
| Base 7 | 10667 | 11107 |
| Base 8 | 6078 | 6178 |
| Base 9 | 4749 | 4839 |
| Base 10 | 39110 | 39910 |
| Base 11 | 32611 | 33311 |
| Base 12 | 28712 | 29312 |
| Base 13 | 24113 | 24913 |
| Base 14 | 1dd14 | 20714 |
| Base 15 | 1b115 | 1b915 |
| Base 16 | 18716 | 18f16 |