18806438944 has 24 divisors (see below), whose sum is σ = 38973871440. Its totient is φ = 8908312896.

The previous prime is 18806438879. The next prime is 18806438947. The reversal of 18806438944 is 44983460881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18806438947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15465214 + ... + 15466429.

It is an arithmetic number, because the mean of its divisors is an integer number (1623911310).

Almost surely, 2^18806438944 is an apocalyptic number.

It is an amenable number.

18806438944 is an abundant number, since it is smaller than the sum of its proper divisors (20167432496).

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

18806438944 is a wasteful number, since it uses less digits than its factorization.

18806438944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30931672 (or 30931664 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 55.

The spelling of 18806438944 in words is "eighteen billion, eight hundred six million, four hundred thirty-eight thousand, nine hundred forty-four".