Numbers / 415

The Number 415

415 is composite: factorization 5 × 83. That gives 415 exactly 4 divisors: 1, 5, 83, 415. 415's proper divisors total just 89, 326 short of 415, the deficient case most of 415's neighbors share too. 415 has a digit sum of 10; for 415, the digital root works out to 1. 415: 5 all divide 415 evenly, out of 2-12. 415 is 110011111 in binary and 19F in hex; as a Roman numeral it's CDXV.