856239 has 16 divisors (see below), whose sum is σ = 1228032. Its totient is φ = 528768.

The previous prime is 856237. The next prime is 856241. The reversal of 856239 is 932658.

It is a happy number.

856239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (856237) and next prime (856241).

It is not a de Polignac number, because 856239 - 2¹ = 856237 is a prime.

856239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856237) 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, 5172 + ... + 5334.

It is an arithmetic number, because the mean of its divisors is an integer number (76752).

2⁸⁵⁶²³⁹ is an apocalyptic number.

856239 is a deficient number, since it is larger than the sum of its proper divisors (371793).

856239 is a wasteful number, since it uses less digits than its factorization.

856239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286.

The product of its digits is 12960, while the sum is 33.

The square root of 856239 is about 925.3318323715. The cubic root of 856239 is about 94.9580239301.

The spelling of 856239 in words is "eight hundred fifty-six thousand, two hundred thirty-nine".