189923091 has 16 divisors (see below), whose sum is σ = 257581824. Its totient is φ = 124448544.

The previous prime is 189923053. The next prime is 189923093. The reversal of 189923091 is 190329981.

It is not a de Polignac number, because 189923091 - 2¹⁴ = 189906707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189923093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130530 + ... + 131976.

It is an arithmetic number, because the mean of its divisors is an integer number (16098864).

Almost surely, 2^189923091 is an apocalyptic number.

189923091 is a deficient number, since it is larger than the sum of its proper divisors (67658733).

189923091 is a wasteful number, since it uses less digits than its factorization.

189923091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 189923091 is about 13781.2586870721. The cubic root of 189923091 is about 574.8121286671.

The spelling of 189923091 in words is "one hundred eighty-nine million, nine hundred twenty-three thousand, ninety-one".