856039 has 4 divisors (see below), whose sum is σ = 876960. Its totient is φ = 835120.

The previous prime is 856021. The next prime is 856043. The reversal of 856039 is 930658.

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

It is a cyclic number.

It is not a de Polignac number, because 856039 - 2⁹ = 855527 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10399 + ... + 10480.

It is an arithmetic number, because the mean of its divisors is an integer number (219240).

2⁸⁵⁶⁰³⁹ is an apocalyptic number.

856039 is a deficient number, since it is larger than the sum of its proper divisors (20921).

856039 is a wasteful number, since it uses less digits than its factorization.

856039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20920.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 856039 is about 925.2237567205. The cubic root of 856039 is about 94.9506299339.

It can be divided in two parts, 85 and 6039, that multiplied together give a palindrome (513315).

The spelling of 856039 in words is "eight hundred fifty-six thousand, thirty-nine".