189421686928 has 20 divisors (see below), whose sum is σ = 368062179120. Its totient is φ = 94437898784.

The previous prime is 189421686889. The next prime is 189421686931. The reversal of 189421686928 is 829686124981.

It is a self number, because there is not a number n which added to its sum of digits gives 189421686928.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17053318 + ... + 17064421.

It is an arithmetic number, because the mean of its divisors is an integer number (18403108956).

Almost surely, 2^189421686928 is an apocalyptic number.

It is an amenable number.

189421686928 is a deficient number, since it is larger than the sum of its proper divisors (178640492192).

189421686928 is a wasteful number, since it uses less digits than its factorization.

189421686928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34118094 (or 34118088 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 64.

The spelling of 189421686928 in words is "one hundred eighty-nine billion, four hundred twenty-one million, six hundred eighty-six thousand, nine hundred twenty-eight".