856427 has 16 divisors (see below), whose sum is σ = 1034208. Its totient is φ = 698880.

The previous prime is 856421. The next prime is 856441. The reversal of 856427 is 724658.

856427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 856427 - 2⁴ = 856411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856393 and 856402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856421) 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, 7523 + ... + 7635.

It is an arithmetic number, because the mean of its divisors is an integer number (64638).

2⁸⁵⁶⁴²⁷ is an apocalyptic number.

856427 is a deficient number, since it is larger than the sum of its proper divisors (177781).

856427 is a wasteful number, since it uses less digits than its factorization.

856427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190.

The product of its digits is 13440, while the sum is 32.

The square root of 856427 is about 925.4334119752. The cubic root of 856427 is about 94.9649732367.

Subtracting from 856427 its reverse (724658), we obtain a square (131769 = 363²).

The spelling of 856427 in words is "eight hundred fifty-six thousand, four hundred twenty-seven".