856669 has 8 divisors (see below), whose sum is σ = 955008. Its totient is φ = 761760.

The previous prime is 856649. The next prime is 856693. The reversal of 856669 is 966658.

856669 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 a cyclic number.

It is not a de Polignac number, because 856669 - 2⁵ = 856637 is a prime.

It is a super-2 number, since 2×856669² = 1467763551122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312 + ... + 1345.

It is an arithmetic number, because the mean of its divisors is an integer number (119376).

2⁸⁵⁶⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

856669 is a deficient number, since it is larger than the sum of its proper divisors (98339).

856669 is a wasteful number, since it uses less digits than its factorization.

856669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715.

The product of its digits is 77760, while the sum is 40.

The square root of 856669 is about 925.5641522877. The cubic root of 856669 is about 94.9739171238.

The spelling of 856669 in words is "eight hundred fifty-six thousand, six hundred sixty-nine".