Numbers / 869

The Number 869

869 is composite: factorization 11 × 79. That gives 869 exactly 4 divisors: 1, 11, 79, 869. 869's proper divisors total just 91, 778 short of 869, the deficient case most of 869's neighbors share too. 869 has a digit sum of 23; for 869, the digital root works out to 5. 869: 11 all divide 869 evenly, out of 2-12. 869 is 1101100101 in binary and 365 in hex; as a Roman numeral it's DCCCLXIX.