Numbers / 975

The Number 975

975 is composite: factorization 3 × 5^2 × 13. That gives 975 exactly 12 divisors: 1, 3, 5, 13, 15, 25, 39, 65, 75, 195, 325, 975. 975's proper divisors total just 761, 214 short of 975, the deficient case most of 975's neighbors share too. 975 has a digit sum of 21; for 975, the digital root works out to 3. 975: 3, 5 all divide 975 evenly, out of 2-12. 975 is 1111001111 in binary and 3CF in hex; as a Roman numeral it's CMLXXV.