856839539 has 8 divisors (see below), whose sum is σ = 924924960. Its totient is φ = 791323456.

The previous prime is 856839479. The next prime is 856839541. The reversal of 856839539 is 935938658.

856839539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 856839539 - 2⁸ = 856839283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856839239) 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, 641642 + ... + 642975.

It is an arithmetic number, because the mean of its divisors is an integer number (115615620).

Almost surely, 2^856839539 is an apocalyptic number.

856839539 is a deficient number, since it is larger than the sum of its proper divisors (68085421).

856839539 is a wasteful number, since it uses less digits than its factorization.

856839539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284669.

The product of its digits is 6998400, while the sum is 56.

The square root of 856839539 is about 29271.8215866386. The cubic root of 856839539 is about 949.8021892853.

The spelling of 856839539 in words is "eight hundred fifty-six million, eight hundred thirty-nine thousand, five hundred thirty-nine".