856297979 has 4 divisors (see below), whose sum is σ = 858631584. Its totient is φ = 853964376.

The previous prime is 856297951. The next prime is 856297987. The reversal of 856297979 is 979792658.

856297979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 856297979 - 2⁸ = 856297723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856297879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166252 + ... + 1166985.

It is an arithmetic number, because the mean of its divisors is an integer number (214657896).

Almost surely, 2^856297979 is an apocalyptic number.

856297979 is a deficient number, since it is larger than the sum of its proper divisors (2333605).

856297979 is a wasteful number, since it uses less digits than its factorization.

856297979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333604.

The product of its digits is 17146080, while the sum is 62.

The square root of 856297979 is about 29262.5695898361. The cubic root of 856297979 is about 949.6020416274.

The spelling of 856297979 in words is "eight hundred fifty-six million, two hundred ninety-seven thousand, nine hundred seventy-nine".