189889988 has 12 divisors (see below), whose sum is σ = 332601360. Its totient is φ = 94861032.

The previous prime is 189889981. The next prime is 189890023. The reversal of 189889988 is 889988981.

189889988 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (189889981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15758 + ... + 25061.

It is an arithmetic number, because the mean of its divisors is an integer number (27716780).

Almost surely, 2^189889988 is an apocalyptic number.

It is an amenable number.

189889988 is a deficient number, since it is larger than the sum of its proper divisors (142711372).

189889988 is a wasteful number, since it uses less digits than its factorization.

189889988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41986 (or 41984 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 68.

The square root of 189889988 is about 13780.0576196183. The cubic root of 189889988 is about 574.7787307420.

The spelling of 189889988 in words is "one hundred eighty-nine million, eight hundred eighty-nine thousand, nine hundred eighty-eight".