Numbers / 259

The Number 259

259 is composite: factorization 7 × 37. That gives 259 exactly 4 divisors: 1, 7, 37, 259. 259's proper divisors total just 45, 214 short of 259, the deficient case most of 259's neighbors share too. 259 has a digit sum of 16; for 259, the digital root works out to 7. 259: 7 all divide 259 evenly, out of 2-12. 259 is 100000011 in binary and 103 in hex; as a Roman numeral it's CCLIX.