Numbers / 805

The Number 805

805 is composite: factorization 5 × 7 × 23. That gives 805 exactly 8 divisors: 1, 5, 7, 23, 35, 115, 161, 805. 805's proper divisors total just 347, 458 short of 805, the deficient case most of 805's neighbors share too. 805 has a digit sum of 13; for 805, the digital root works out to 4. 805: 5, 7 all divide 805 evenly, out of 2-12. 805 is 1100100101 in binary and 325 in hex; as a Roman numeral it's DCCCV.