Numbers / 845

The Number 845

845 is composite: factorization 5 × 13^2. That gives 845 exactly 6 divisors: 1, 5, 13, 65, 169, 845. 845's proper divisors total just 253, 592 short of 845, the deficient case most of 845's neighbors share too. 845 has a digit sum of 17; for 845, the digital root works out to 8. 845: 5 all divide 845 evenly, out of 2-12. 845 is 1101001101 in binary and 34D in hex; as a Roman numeral it's DCCCXLV.