685976 has 16 divisors (see below), whose sum is σ = 1354200. Its totient is φ = 324864.

The previous prime is 685973. The next prime is 685987. The reversal of 685976 is 679586.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2105 + ... + 2408.

2⁶⁸⁵⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

685976 is a deficient number, since it is larger than the sum of its proper divisors (668224).

685976 is a wasteful number, since it uses less digits than its factorization.

685976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4538 (or 4534 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 685976 is about 828.2366811486. The cubic root of 685976 is about 88.1934449737.

It can be divided in two parts, 6859 and 76, that multiplied together give a square (521284 = 722²).

The spelling of 685976 in words is "six hundred eighty-five thousand, nine hundred seventy-six".