856808 has 8 divisors (see below), whose sum is σ = 1606530. Its totient is φ = 428400.

The previous prime is 856799. The next prime is 856811. The reversal of 856808 is 808658.

It can be written as a sum of positive squares in only one way, i.e., 850084 + 6724 = 922^2 + 82^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53543 + ... + 53558.

2⁸⁵⁶⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

856808 is a deficient number, since it is larger than the sum of its proper divisors (749722).

856808 is a wasteful number, since it uses less digits than its factorization.

856808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107107 (or 107103 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 856808 is about 925.6392385806. The cubic root of 856808 is about 94.9790535536.

The spelling of 856808 in words is "eight hundred fifty-six thousand, eight hundred eight".