18388508244 has 12 divisors (see below), whose sum is σ = 42906519264. Its totient is φ = 6129502744.

The previous prime is 18388508231. The next prime is 18388508251. The reversal of 18388508244 is 44280588381.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 766187832 + ... + 766187855.

It is an arithmetic number, because the mean of its divisors is an integer number (3575543272).

Almost surely, 2^18388508244 is an apocalyptic number.

It is an amenable number.

18388508244 is an abundant number, since it is smaller than the sum of its proper divisors (24518011020).

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

18388508244 is a wasteful number, since it uses less digits than its factorization.

18388508244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532375694 (or 1532375692 counting only the distinct ones).

The product of its (nonzero) digits is 1966080, while the sum is 51.

The spelling of 18388508244 in words is "eighteen billion, three hundred eighty-eight million, five hundred eight thousand, two hundred forty-four".