189921025 has 24 divisors (see below), whose sum is σ = 284981760. Its totient is φ = 122568960.

The previous prime is 189921019. The next prime is 189921047. The reversal of 189921025 is 520129981.

189921025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189921025 - 2⁵ = 189920993 is a prime.

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, 28945 + ... + 34894.

It is an arithmetic number, because the mean of its divisors is an integer number (11874240).

Almost surely, 2^189921025 is an apocalyptic number.

It is an amenable number.

189921025 is a deficient number, since it is larger than the sum of its proper divisors (95060735).

189921025 is a wasteful number, since it uses less digits than its factorization.

189921025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63873 (or 63868 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 189921025 is about 13781.1837299994. The cubic root of 189921025 is about 574.8100443740.

The spelling of 189921025 in words is "one hundred eighty-nine million, nine hundred twenty-one thousand, twenty-five".