Numbers / 915

The Number 915

915 is composite: factorization 3 × 5 × 61. That gives 915 exactly 8 divisors: 1, 3, 5, 15, 61, 183, 305, 915. 915's proper divisors total just 573, 342 short of 915, the deficient case most of 915's neighbors share too. 915 has a digit sum of 15; for 915, the digital root works out to 6. 915: 3, 5 all divide 915 evenly, out of 2-12. 915 is 1110010011 in binary and 393 in hex; as a Roman numeral it's CMXV.