188999964 has 72 divisors (see below), whose sum is σ = 495086592. Its totient is φ = 60752160.

The previous prime is 188999939. The next prime is 188999971. The reversal of 188999964 is 469999881.

188999964 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 23 ways as a sum of consecutive naturals, for example, 127749 + ... + 129219.

Almost surely, 2^188999964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 188999964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247543296).

188999964 is an abundant number, since it is smaller than the sum of its proper divisors (306086628).

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

188999964 is a wasteful number, since it uses less digits than its factorization.

188999964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607 (or 1602 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 63.

The square root of 188999964 is about 13747.7257755601. The cubic root of 188999964 is about 573.8793183949.

The spelling of 188999964 in words is "one hundred eighty-eight million, nine hundred ninety-nine thousand, nine hundred sixty-four".