189145923 has 16 divisors (see below), whose sum is σ = 257471136. Its totient is φ = 123468800.

The previous prime is 189145897. The next prime is 189145937. The reversal of 189145923 is 329541981.

It is not a de Polignac number, because 189145923 - 2¹⁰ = 189144899 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (189140923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110611 + ... + 112307.

It is an arithmetic number, because the mean of its divisors is an integer number (16091946).

Almost surely, 2^189145923 is an apocalyptic number.

189145923 is a deficient number, since it is larger than the sum of its proper divisors (68325213).

189145923 is a wasteful number, since it uses less digits than its factorization.

189145923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454.

The product of its digits is 77760, while the sum is 42.

The square root of 189145923 is about 13753.0332290735. The cubic root of 189145923 is about 574.0270103070.

The spelling of 189145923 in words is "one hundred eighty-nine million, one hundred forty-five thousand, nine hundred twenty-three".