189509090 has 16 divisors (see below), whose sum is σ = 343025280. Its totient is φ = 75379440.

The previous prime is 189509069. The next prime is 189509119. The reversal of 189509090 is 90905981.

It is a Curzon 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, 51146 + ... + 54725.

It is an arithmetic number, because the mean of its divisors is an integer number (21439080).

Almost surely, 2^189509090 is an apocalyptic number.

189509090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189509090 is a deficient number, since it is larger than the sum of its proper divisors (153516190).

189509090 is a wasteful number, since it uses less digits than its factorization.

189509090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106057.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 189509090 is about 13766.2300576447. The cubic root of 189509090 is about 574.3941596209.

The spelling of 189509090 in words is "one hundred eighty-nine million, five hundred nine thousand, ninety".