856442 has 4 divisors (see below), whose sum is σ = 1284666. Its totient is φ = 428220.

The previous prime is 856441. The next prime is 856459. The reversal of 856442 is 244658.

856442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 11881 = 919^2 + 109^2 .

It is not an unprimeable number, because it can be changed into a prime (856441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214109 + ... + 214112.

2⁸⁵⁶⁴⁴² is an apocalyptic number.

856442 is a deficient number, since it is larger than the sum of its proper divisors (428224).

856442 is a wasteful number, since it uses less digits than its factorization.

856442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428223.

The product of its digits is 7680, while the sum is 29.

The square root of 856442 is about 925.4415162505. The cubic root of 856442 is about 94.9655276589.

The spelling of 856442 in words is "eight hundred fifty-six thousand, four hundred forty-two".