Numbers / 693

The Number 693

693 is composite: factorization 3^2 × 7 × 11. That gives 693 exactly 12 divisors: 1, 3, 7, 9, 11, 21, 33, 63, 77, 99, 231, 693. 693's proper divisors total just 555, 138 short of 693, the deficient case most of 693's neighbors share too. 693 has a digit sum of 18; for 693, the digital root works out to 9. 693: 3, 7, 9, 11 all divide 693 evenly, out of 2-12. 693 is 1010110101 in binary and 2B5 in hex; as a Roman numeral it's DCXCIII.