Numbers / 455

The Number 455

455 is composite: factorization 5 × 7 × 13. That gives 455 exactly 8 divisors: 1, 5, 7, 13, 35, 65, 91, 455. 455's proper divisors total just 217, 238 short of 455, the deficient case most of 455's neighbors share too. 455 has a digit sum of 14; for 455, the digital root works out to 5. 455: 5, 7 all divide 455 evenly, out of 2-12. 455 is 111000111 in binary and 1C7 in hex; as a Roman numeral it's CDLV.