Numbers / 855

The Number 855

855 is composite: factorization 3^2 × 5 × 19. That gives 855 exactly 12 divisors: 1, 3, 5, 9, 15, 19, 45, 57, 95, 171, 285, 855. 855's proper divisors total just 705, 150 short of 855, the deficient case most of 855's neighbors share too. 855 has a digit sum of 18; for 855, the digital root works out to 9. 855: 3, 5, 9 all divide 855 evenly, out of 2-12. 855 is 1101010111 in binary and 357 in hex; as a Roman numeral it's DCCCLV.