Compare 391 vs 400
| Property | 391 | 400 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 2 |
| Total factors | 2 | 6 |
| Prime factorization | 171 × 231 | 24 × 52 |
| Prime factorization | 17 × 23 | 2 × 2 × 2 × 2 × 5 × 5 |
| Divisors count | 4 | 15 |
| Divisors | 1, 17, 23, 391 | 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400 |
| Number of properties | 1 | 0 |
| Semiprimes | 122nd | |
| Roman numberals | CCCXCI | CD |
| Base 2 | 1100001112 | 1100100002 |
| Base 3 | 1121113 | 1122113 |
| Base 4 | 120134 | 121004 |
| Base 5 | 30315 | 31005 |
| Base 6 | 14516 | 15046 |
| Base 7 | 10667 | 11117 |
| Base 8 | 6078 | 6208 |
| Base 9 | 4749 | 4849 |
| Base 10 | 39110 | 40010 |
| Base 11 | 32611 | 33411 |
| Base 12 | 28712 | 29412 |
| Base 13 | 24113 | 24a13 |
| Base 14 | 1dd14 | 20814 |
| Base 15 | 1b115 | 1ba15 |
| Base 16 | 18716 | 19016 |