Numbers / 215

The Number 215

215 is composite: factorization 5 × 43. That gives 215 exactly 4 divisors: 1, 5, 43, 215. 215's proper divisors total just 49, 166 short of 215, the deficient case most of 215's neighbors share too. 215 has a digit sum of 8; for 215, the digital root works out to 8. 215: 5 all divide 215 evenly, out of 2-12. 215 is 11010111 in binary and D7 in hex; as a Roman numeral it's CCXV.