856684 has 12 divisors (see below), whose sum is σ = 1524208. Its totient is φ = 421200.

The previous prime is 856649. The next prime is 856693. The reversal of 856684 is 486658.

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, 1512 + ... + 1999.

2⁸⁵⁶⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

856684 is a deficient number, since it is larger than the sum of its proper divisors (667524).

856684 is a wasteful number, since it uses less digits than its factorization.

856684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 3574 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 856684 is about 925.5722554182. The cubic root of 856684 is about 94.9744714416.

It can be divided in two parts, 856 and 684, that added together give a triangular number (1540 = T₅₅).

The spelling of 856684 in words is "eight hundred fifty-six thousand, six hundred eighty-four".