189901188 has 36 divisors (see below), whose sum is σ = 480549888. Its totient is φ = 63231600.

The previous prime is 189901183. The next prime is 189901189. The reversal of 189901188 is 881109981.

189901188 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×189901188² = 72124922407622688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189901183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39145 + ... + 43727.

It is an arithmetic number, because the mean of its divisors is an integer number (13348608).

Almost surely, 2^189901188 is an apocalyptic number.

189901188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

189901188 is an abundant number, since it is smaller than the sum of its proper divisors (290648700).

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

189901188 is a wasteful number, since it uses less digits than its factorization.

189901188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744 (or 5739 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 45.

The square root of 189901188 is about 13780.4639979937. The cubic root of 189901188 is about 574.7900309607.

The spelling of 189901188 in words is "one hundred eighty-nine million, nine hundred one thousand, one hundred eighty-eight".