Numbers / 993

The Number 993

993 is composite: factorization 3 × 331. That gives 993 exactly 4 divisors: 1, 3, 331, 993. 993's proper divisors total just 335, 658 short of 993, the deficient case most of 993's neighbors share too. 993 has a digit sum of 21; for 993, the digital root works out to 3. 993: 3 all divide 993 evenly, out of 2-12. 993 is 1111100001 in binary and 3E1 in hex; as a Roman numeral it's CMXCIII.