856923964 has 36 divisors (see below), whose sum is σ = 1719388944. Its totient is φ = 372233472.

The previous prime is 856923953. The next prime is 856923971. The reversal of 856923964 is 469329658.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25792 + ... + 48775.

It is an arithmetic number, because the mean of its divisors is an integer number (47760804).

Almost surely, 2^856923964 is an apocalyptic number.

It is an amenable number.

856923964 is an abundant number, since it is smaller than the sum of its proper divisors (862464980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856923964 is a wasteful number, since it uses less digits than its factorization.

856923964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74614 (or 74599 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 52.

The square root of 856923964 is about 29273.2636376609. The cubic root of 856923964 is about 949.8333831525.

The spelling of 856923964 in words is "eight hundred fifty-six million, nine hundred twenty-three thousand, nine hundred sixty-four".