18239893344 has 36 divisors (see below), whose sum is σ = 51869697516. Its totient is φ = 6079964352.

The previous prime is 18239893307. The next prime is 18239893363. The reversal of 18239893344 is 44339893281.

18239893344 is a `hidden beast` number, since 182 + 39 + 8 + 93 + 344 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31666194 + ... + 31666769.

It is an arithmetic number, because the mean of its divisors is an integer number (1440824931).

Almost surely, 2^18239893344 is an apocalyptic number.

It is an amenable number.

18239893344 is an abundant number, since it is smaller than the sum of its proper divisors (33629804172).

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

18239893344 is a wasteful number, since it uses less digits than its factorization.

18239893344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63332979 (or 63332968 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 18239893344 in words is "eighteen billion, two hundred thirty-nine million, eight hundred ninety-three thousand, three hundred forty-four".