Numbers / 172

The Number 172

172 is composite: factorization 2^2 × 43. That gives 172 exactly 6 divisors: 1, 2, 4, 43, 86, 172. 172's proper divisors total just 136, 36 short of 172, the deficient case most of 172's neighbors share too. 172 has a digit sum of 10; for 172, the digital root works out to 1. 172: 2, 4 all divide 172 evenly, out of 2-12. 172 is 10101100 in binary and AC in hex; as a Roman numeral it's CLXXII.