189133945 has 128 divisors (see below), whose sum is σ = 334430208. Its totient is φ = 98841600.

The previous prime is 189133937. The next prime is 189133951. The reversal of 189133945 is 549331981.

It is not a de Polignac number, because 189133945 - 2³ = 189133937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3568539 + ... + 3568591.

It is an arithmetic number, because the mean of its divisors is an integer number (2612736).

Almost surely, 2^189133945 is an apocalyptic number.

It is an amenable number.

189133945 is a deficient number, since it is larger than the sum of its proper divisors (145296263).

189133945 is a wasteful number, since it uses less digits than its factorization.

189133945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143.

The product of its digits is 116640, while the sum is 43.

The square root of 189133945 is about 13752.5977546062. The cubic root of 189133945 is about 574.0148929594.

The spelling of 189133945 in words is "one hundred eighty-nine million, one hundred thirty-three thousand, nine hundred forty-five".