856856 has 64 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 305280.

The previous prime is 856853. The next prime is 856897. The reversal of 856856 is 658658.

Its product of digits (57600) is a multiple of the sum of its prime factors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7955 + ... + 8061.

It is an arithmetic number, because the mean of its divisors is an integer number (34020).

2⁸⁵⁶⁸⁵⁶ 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 856856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

856856 is an abundant number, since it is smaller than the sum of its proper divisors (1320424).

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

856856 is a wasteful number, since it uses less digits than its factorization.

856856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 140 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 856856 is about 925.6651662453. The cubic root of 856856 is about 94.9808271557.

The spelling of 856856 in words is "eight hundred fifty-six thousand, eight hundred fifty-six".