Numbers / 538

The Number 538

538 is composite: factorization 2 × 269. That gives 538 exactly 4 divisors: 1, 2, 269, 538. 538's proper divisors total just 272, 266 short of 538, the deficient case most of 538's neighbors share too. 538 has a digit sum of 16; for 538, the digital root works out to 7. 538: 2 all divide 538 evenly, out of 2-12. 538 is 1000011010 in binary and 21A in hex; as a Roman numeral it's DXXXVIII.