856131884 has 24 divisors (see below), whose sum is σ = 1536288768. Its totient is φ = 417266000.

The previous prime is 856131791. The next prime is 856131907. The reversal of 856131884 is 488131658.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38117 + ... + 56259.

It is an arithmetic number, because the mean of its divisors is an integer number (64012032).

Almost surely, 2^856131884 is an apocalyptic number.

It is an amenable number.

856131884 is a deficient number, since it is larger than the sum of its proper divisors (680156884).

856131884 is a wasteful number, since it uses less digits than its factorization.

856131884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18445 (or 18443 counting only the distinct ones).

The product of its digits is 184320, while the sum is 44.

The square root of 856131884 is about 29259.7314410095. The cubic root of 856131884 is about 949.5406399681.

The spelling of 856131884 in words is "eight hundred fifty-six million, one hundred thirty-one thousand, eight hundred eighty-four".