856438 has 12 divisors (see below), whose sum is σ = 1412460. Its totient is φ = 389180.

The previous prime is 856421. The next prime is 856441. The reversal of 856438 is 834658.

856438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1528 + ... + 2011.

It is an arithmetic number, because the mean of its divisors is an integer number (117705).

2⁸⁵⁶⁴³⁸ is an apocalyptic number.

856438 is a deficient number, since it is larger than the sum of its proper divisors (556022).

856438 is a wasteful number, since it uses less digits than its factorization.

856438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563 (or 3552 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 856438 is about 925.4393551173. The cubic root of 856438 is about 94.9653798136.

The spelling of 856438 in words is "eight hundred fifty-six thousand, four hundred thirty-eight".