856842 has 32 divisors (see below), whose sum is σ = 2045952. Its totient is φ = 233904.

The previous prime is 856841. The next prime is 856847. The reversal of 856842 is 248658.

It is not an unprimeable number, because it can be changed into a prime (856841) 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, 523 + ... + 1409.

It is an arithmetic number, because the mean of its divisors is an integer number (63936).

2⁸⁵⁶⁸⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1022976).

856842 is an abundant number, since it is smaller than the sum of its proper divisors (1189110).

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

856842 is a wasteful number, since it uses less digits than its factorization.

856842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922.

The product of its digits is 15360, while the sum is 33.

The square root of 856842 is about 925.6576040848. The cubic root of 856842 is about 94.9803098620.

The spelling of 856842 in words is "eight hundred fifty-six thousand, eight hundred forty-two".