189899442 has 12 divisors (see below), whose sum is σ = 411448830. Its totient is φ = 63299808.

The previous prime is 189899407. The next prime is 189899447. The reversal of 189899442 is 244998981.

It can be written as a sum of positive squares in only one way, i.e., 179265321 + 10634121 = 13389^2 + 3261^2 .

It is a super-2 number, since 2×189899442² = 72123596143822728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189899447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5274967 + ... + 5275002.

Almost surely, 2^189899442 is an apocalyptic number.

189899442 is an abundant number, since it is smaller than the sum of its proper divisors (221549388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189899442 is a wasteful number, since it uses less digits than its factorization.

189899442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10549977 (or 10549974 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 189899442 is about 13780.4006472961. The cubic root of 189899442 is about 574.7882693666.

The spelling of 189899442 in words is "one hundred eighty-nine million, eight hundred ninety-nine thousand, four hundred forty-two".