856880639 has 8 divisors (see below), whose sum is σ = 902951040. Its totient is φ = 810907416.

The previous prime is 856880599. The next prime is 856880653. The reversal of 856880639 is 936088658.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856880639 - 2¹⁶ = 856815103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856880539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5819 + ... + 41804.

It is an arithmetic number, because the mean of its divisors is an integer number (112868880).

Almost surely, 2^856880639 is an apocalyptic number.

856880639 is a deficient number, since it is larger than the sum of its proper divisors (46070401).

856880639 is a wasteful number, since it uses less digits than its factorization.

856880639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48589.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The square root of 856880639 is about 29272.5236185745. The cubic root of 856880639 is about 949.8173754215.

The spelling of 856880639 in words is "eight hundred fifty-six million, eight hundred eighty thousand, six hundred thirty-nine".