189639984 has 40 divisors (see below), whose sum is σ = 496623472. Its totient is φ = 62346240.

The previous prime is 189639973. The next prime is 189640027. The reversal of 189639984 is 489936981.

189639984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23557 + ... + 30564.

Almost surely, 2^189639984 is an apocalyptic number.

It is an amenable number.

189639984 is an abundant number, since it is smaller than the sum of its proper divisors (306983488).

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

189639984 is a wasteful number, since it uses less digits than its factorization.

189639984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54205 (or 54199 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 57.

The square root of 189639984 is about 13770.9834071500. The cubic root of 189639984 is about 574.5263739397.

The spelling of 189639984 in words is "one hundred eighty-nine million, six hundred thirty-nine thousand, nine hundred eighty-four".