861983884 has 24 divisors (see below), whose sum is σ = 1529656128. Its totient is φ = 424960080.

The previous prime is 861983879. The next prime is 861983909. The reversal of 861983884 is 488389168.

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, 187299 + ... + 191845.

It is an arithmetic number, because the mean of its divisors is an integer number (63735672).

Almost surely, 2^861983884 is an apocalyptic number.

It is an amenable number.

861983884 is a deficient number, since it is larger than the sum of its proper divisors (667672244).

861983884 is a wasteful number, since it uses less digits than its factorization.

861983884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205 (or 5203 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 55.

The square root of 861983884 is about 29359.5620539544. The cubic root of 861983884 is about 951.6992244164.

The spelling of 861983884 in words is "eight hundred sixty-one million, nine hundred eighty-three thousand, eight hundred eighty-four".