Numbers / 115

The Number 115

115 is composite: factorization 5 × 23. That gives 115 exactly 4 divisors: 1, 5, 23, 115. 115's proper divisors total just 29, 86 short of 115, the deficient case most of 115's neighbors share too. 115 has a digit sum of 7; for 115, the digital root works out to 7. 115: 5 all divide 115 evenly, out of 2-12. 115 is 1110011 in binary and 73 in hex; as a Roman numeral it's CXV.