189618372 has 18 divisors (see below), whose sum is σ = 479313198. Its totient is φ = 63206112.

The previous prime is 189618367. The next prime is 189618421. The reversal of 189618372 is 273816981.

It can be written as a sum of positive squares in only one way, i.e., 188952516 + 665856 = 13746^2 + 816^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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, 2633553 + ... + 2633624.

It is an arithmetic number, because the mean of its divisors is an integer number (26628511).

Almost surely, 2^189618372 is an apocalyptic number.

189618372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

189618372 is an abundant number, since it is smaller than the sum of its proper divisors (289694826).

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

189618372 is a wasteful number, since it uses less digits than its factorization.

189618372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5267187 (or 5267182 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 189618372 is about 13770.1986913770. The cubic root of 189618372 is about 574.5045481351.

The spelling of 189618372 in words is "one hundred eighty-nine million, six hundred eighteen thousand, three hundred seventy-two".