189959988 has 12 divisors (see below), whose sum is σ = 443240000. Its totient is φ = 63319992.

The previous prime is 189959983. The next prime is 189959993. The reversal of 189959988 is 889959981.

189959988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (189959983) and next prime (189959993).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189959983) 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, 7914988 + ... + 7915011.

Almost surely, 2^189959988 is an apocalyptic number.

It is an amenable number.

189959988 is an abundant number, since it is smaller than the sum of its proper divisors (253280012).

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

189959988 is a wasteful number, since it uses less digits than its factorization.

189959988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15830006 (or 15830004 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 66.

The square root of 189959988 is about 13782.5972878845. The cubic root of 189959988 is about 574.8493498210.

The spelling of 189959988 in words is "one hundred eighty-nine million, nine hundred fifty-nine thousand, nine hundred eighty-eight".