686906 has 8 divisors (see below), whose sum is σ = 1124064. Its totient is φ = 312220.

The previous prime is 686897. The next prime is 686911. The reversal of 686906 is 609686.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 15590 + ... + 15633.

It is an arithmetic number, because the mean of its divisors is an integer number (140508).

2⁶⁸⁶⁹⁰⁶ is an apocalyptic number.

686906 is a deficient number, since it is larger than the sum of its proper divisors (437158).

686906 is a wasteful number, since it uses less digits than its factorization.

686906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31236.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 686906 is about 828.7979247078. The cubic root of 686906 is about 88.2332825511.

The spelling of 686906 in words is "six hundred eighty-six thousand, nine hundred six".