Numbers / 945

The Number 945

945 is composite: factorization 3^3 × 5 × 7. That gives 945 exactly 16 divisors: 1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 105, 135, 189, 315, 945. 945's proper divisors total 975, 30 more than 945 itself, so 945 is abundant. 945 has a digit sum of 18; for 945, the digital root works out to 9. 945: 3, 5, 7, 9 all divide 945 evenly, out of 2-12. 945 is 1110110001 in binary and 3B1 in hex; as a Roman numeral it's CMXLV.