189909872 has 20 divisors (see below), whose sum is σ = 368762856. Its totient is φ = 94745280.

The previous prime is 189909859. The next prime is 189909899. The reversal of 189909872 is 278909981.

189909872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 5498 + ... + 20249.

Almost surely, 2^189909872 is an apocalyptic number.

It is an amenable number.

189909872 is a deficient number, since it is larger than the sum of its proper divisors (178852984).

189909872 is a wasteful number, since it uses less digits than its factorization.

189909872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26216 (or 26210 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 189909872 is about 13780.7790781218. The cubic root of 189909872 is about 574.7987923603.

The spelling of 189909872 in words is "one hundred eighty-nine million, nine hundred nine thousand, eight hundred seventy-two".