Numbers / 865

The Number 865

865 is composite: factorization 5 × 173. That gives 865 exactly 4 divisors: 1, 5, 173, 865. 865's proper divisors total just 179, 686 short of 865, the deficient case most of 865's neighbors share too. 865 has a digit sum of 19; for 865, the digital root works out to 1. 865: 5 all divide 865 evenly, out of 2-12. 865 is 1101100001 in binary and 361 in hex; as a Roman numeral it's DCCCLXV.