856520 has 96 divisors (see below), whose sum is σ = 2462400. Its totient is φ = 266112.

The previous prime is 856519. The next prime is 856529. The reversal of 856520 is 25658.

It is a self number, because there is not a number n which added to its sum of digits gives 856520.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 856520.

It is not an unprimeable number, because it can be changed into a prime (856529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37229 + ... + 37251.

It is an arithmetic number, because the mean of its divisors is an integer number (25650).

2⁸⁵⁶⁵²⁰ 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 856520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1231200).

856520 is an abundant number, since it is smaller than the sum of its proper divisors (1605880).

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

856520 is a wasteful number, since it uses less digits than its factorization.

856520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 856520 is about 925.4836573382. The cubic root of 856520 is about 94.9684105497.

The spelling of 856520 in words is "eight hundred fifty-six thousand, five hundred twenty".