856772 has 24 divisors (see below), whose sum is σ = 1761984. Its totient is φ = 356832.

The previous prime is 856759. The next prime is 856787. The reversal of 856772 is 277658.

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, 623 + ... + 1449.

It is an arithmetic number, because the mean of its divisors is an integer number (73416).

2⁸⁵⁶⁷⁷² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880992).

856772 is an abundant number, since it is smaller than the sum of its proper divisors (905212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856772 is a wasteful number, since it uses less digits than its factorization.

856772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 873 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 856772 is about 925.6197923554. The cubic root of 856772 is about 94.9777233086.

The spelling of 856772 in words is "eight hundred fifty-six thousand, seven hundred seventy-two".