189038390 has 16 divisors (see below), whose sum is σ = 345848400. Its totient is φ = 74375520.

The previous prime is 189038387. The next prime is 189038401. The reversal of 189038390 is 93830981.

It is a Curzon number.

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, 154340 + ... + 155559.

It is an arithmetic number, because the mean of its divisors is an integer number (21615525).

Almost surely, 2^189038390 is an apocalyptic number.

189038390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189038390 is a deficient number, since it is larger than the sum of its proper divisors (156810010).

189038390 is a wasteful number, since it uses less digits than its factorization.

189038390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309967.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 189038390 is about 13749.1232447746. The cubic root of 189038390 is about 573.9182079833.

The spelling of 189038390 in words is "one hundred eighty-nine million, thirty-eight thousand, three hundred ninety".