189489918 has 16 divisors (see below), whose sum is σ = 391205376. Its totient is φ = 61125720.

The previous prime is 189489877. The next prime is 189489919. The reversal of 189489918 is 819984981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189489919) 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 7 ways as a sum of consecutive naturals, for example, 509196 + ... + 509567.

It is an arithmetic number, because the mean of its divisors is an integer number (24450336).

Almost surely, 2^189489918 is an apocalyptic number.

189489918 is an abundant number, since it is smaller than the sum of its proper divisors (201715458).

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

189489918 is a wasteful number, since it uses less digits than its factorization.

189489918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018799.

The product of its digits is 1492992, while the sum is 57.

The square root of 189489918 is about 13765.5336983351. The cubic root of 189489918 is about 574.3747891231.

The spelling of 189489918 in words is "one hundred eighty-nine million, four hundred eighty-nine thousand, nine hundred eighteen".