189165904 has 40 divisors (see below), whose sum is σ = 383580360. Its totient is φ = 90275328.

The previous prime is 189165887. The next prime is 189165913. The reversal of 189165904 is 409561981.

It can be written as a sum of positive squares in 4 ways, for example, as 133633600 + 55532304 = 11560^2 + 7452^2 .

It is a super-2 number, since 2×189165904² = 71567478472274432, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 28362 + ... + 34390.

It is an arithmetic number, because the mean of its divisors is an integer number (9589509).

Almost surely, 2^189165904 is an apocalyptic number.

It is an amenable number.

189165904 is an abundant number, since it is smaller than the sum of its proper divisors (194414456).

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

189165904 is a wasteful number, since it uses less digits than its factorization.

189165904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127 (or 6121 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 189165904 is about 13753.7596314608. The cubic root of 189165904 is about 574.0472226200.

The spelling of 189165904 in words is "one hundred eighty-nine million, one hundred sixty-five thousand, nine hundred four".