686908 has 12 divisors (see below), whose sum is σ = 1217160. Its totient is φ = 339152.

The previous prime is 686897. The next prime is 686911. The reversal of 686908 is 809686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703 + ... + 1366.

It is an arithmetic number, because the mean of its divisors is an integer number (101430).

2⁶⁸⁶⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

686908 is a deficient number, since it is larger than the sum of its proper divisors (530252).

686908 is a wasteful number, since it uses less digits than its factorization.

686908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156 (or 2154 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 686908 is about 828.7991312737. The cubic root of 686908 is about 88.2333681845.

The spelling of 686908 in words is "six hundred eighty-six thousand, nine hundred eight".