856572 has 24 divisors (see below), whose sum is σ = 2048592. Its totient is φ = 278400.

The previous prime is 856571. The next prime is 856627. The reversal of 856572 is 275658.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379 + ... + 1362.

It is an arithmetic number, because the mean of its divisors is an integer number (85358).

2⁸⁵⁶⁵⁷² is an apocalyptic number.

856572 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

856572 is an abundant number, since it is smaller than the sum of its proper divisors (1192020).

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

856572 is a wasteful number, since it uses less digits than its factorization.

856572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789 (or 1787 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 856572 is about 925.5117503306. The cubic root of 856572 is about 94.9703323796.

The spelling of 856572 in words is "eight hundred fifty-six thousand, five hundred seventy-two".