856964939 has 2 divisors, whose sum is σ = 856964940. Its totient is φ = 856964938.

The previous prime is 856964921. The next prime is 856964971. The reversal of 856964939 is 939469658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856964939 - 2⁸ = 856964683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (856964909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428482469 + 428482470.

It is an arithmetic number, because the mean of its divisors is an integer number (428482470).

Almost surely, 2^856964939 is an apocalyptic number.

856964939 is a deficient number, since it is larger than the sum of its proper divisors (1).

856964939 is an equidigital number, since it uses as much as digits as its factorization.

856964939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 59.

The square root of 856964939 is about 29273.9635000114. The cubic root of 856964939 is about 949.8485221085.

The spelling of 856964939 in words is "eight hundred fifty-six million, nine hundred sixty-four thousand, nine hundred thirty-nine".