Numbers / 518

The Number 518

518 is composite: factorization 2 × 7 × 37. That gives 518 exactly 8 divisors: 1, 2, 7, 14, 37, 74, 259, 518. 518's proper divisors total just 394, 124 short of 518, the deficient case most of 518's neighbors share too. 518 has a digit sum of 14; for 518, the digital root works out to 5. 518: 2, 7 all divide 518 evenly, out of 2-12. 518 is 1000000110 in binary and 206 in hex; as a Roman numeral it's DXVIII.