856685 has 8 divisors (see below), whose sum is σ = 1061376. Its totient is φ = 663120.

The previous prime is 856649. The next prime is 856693. The reversal of 856685 is 586658.

856685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 856685 - 2¹² = 852589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2609 + ... + 2918.

It is an arithmetic number, because the mean of its divisors is an integer number (132672).

2⁸⁵⁶⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

856685 is a deficient number, since it is larger than the sum of its proper divisors (204691).

856685 is a wasteful number, since it uses less digits than its factorization.

856685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563.

The product of its digits is 57600, while the sum is 38.

The square root of 856685 is about 925.5727956244. The cubic root of 856685 is about 94.9745083958.

The spelling of 856685 in words is "eight hundred fifty-six thousand, six hundred eighty-five".