856604 has 12 divisors (see below), whose sum is σ = 1713264. Its totient is φ = 367104.

The previous prime is 856571. The next prime is 856627. The reversal of 856604 is 406658.

856604 is an admirable number.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

856604 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15269 + ... + 15324.

It is an arithmetic number, because the mean of its divisors is an integer number (142772).

2⁸⁵⁶⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

856604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856604 is a wasteful number, since it uses less digits than its factorization.

856604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30604 (or 30602 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 856604 is about 925.5290379021. The cubic root of 856604 is about 94.9715150056.

The spelling of 856604 in words is "eight hundred fifty-six thousand, six hundred four".