172890189 has 12 divisors (see below), whose sum is σ = 249867072. Its totient is φ = 115197000.

The previous prime is 172890173. The next prime is 172890197. The reversal of 172890189 is 981098271.

It is not a de Polignac number, because 172890189 - 2⁴ = 172890173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172890089) 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, 17074 + ... + 25244.

It is an arithmetic number, because the mean of its divisors is an integer number (20822256).

Almost surely, 2^172890189 is an apocalyptic number.

It is an amenable number.

172890189 is a deficient number, since it is larger than the sum of its proper divisors (76976883).

172890189 is a wasteful number, since it uses less digits than its factorization.

172890189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10528 (or 10525 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 172890189 is about 13148.7713874719. The cubic root of 172890189 is about 557.0875460166.

The spelling of 172890189 in words is "one hundred seventy-two million, eight hundred ninety thousand, one hundred eighty-nine".