Numbers / 585

The Number 585

585 is composite: factorization 3^2 × 5 × 13. That gives 585 exactly 12 divisors: 1, 3, 5, 9, 13, 15, 39, 45, 65, 117, 195, 585. 585's proper divisors total just 507, 78 short of 585, the deficient case most of 585's neighbors share too. 585 is also a palindrome, since 585 reads identically forwards and backwards. 585 has a digit sum of 18; for 585, the digital root works out to 9. 585: 3, 5, 9 all divide 585 evenly, out of 2-12. 585 is 1001001001 in binary and 249 in hex; as a Roman numeral it's DLXXXV.