856731 has 8 divisors (see below), whose sum is σ = 1146960. Its totient is φ = 568832.

The previous prime is 856721. The next prime is 856733. The reversal of 856731 is 137658.

856731 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 856731 - 2⁵ = 856699 is a prime.

It is a super-2 number, since 2×856731² = 1467976012722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (856733) 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, 655 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (143370).

2⁸⁵⁶⁷³¹ is an apocalyptic number.

856731 is a deficient number, since it is larger than the sum of its proper divisors (290229).

856731 is a wasteful number, since it uses less digits than its factorization.

856731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165.

The product of its digits is 5040, while the sum is 30.

The square root of 856731 is about 925.5976447680. The cubic root of 856731 is about 94.9762082619.

The spelling of 856731 in words is "eight hundred fifty-six thousand, seven hundred thirty-one".