Numbers / 799

The Number 799

799 is composite: factorization 17 × 47. That gives 799 exactly 4 divisors: 1, 17, 47, 799. 799's proper divisors total just 65, 734 short of 799, the deficient case most of 799's neighbors share too. 799 has a digit sum of 25; for 799, the digital root works out to 7. 799 shares no factor with 2-12; 799's own divisors start beyond that range. 799 is 1100011111 in binary and 31F in hex; as a Roman numeral it's DCCXCIX.