18939379008 has 112 divisors (see below), whose sum is σ = 54731741184. Its totient is φ = 5732298240.

The previous prime is 18939378977. The next prime is 18939379009. The reversal of 18939379008 is 80097393981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939379009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1910641 + ... + 1920527.

Almost surely, 2^18939379008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18939379008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27365870592).

18939379008 is an abundant number, since it is smaller than the sum of its proper divisors (35792362176).

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

18939379008 is a wasteful number, since it uses less digits than its factorization.

18939379008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10820 (or 10810 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 57.

The spelling of 18939379008 in words is "eighteen billion, nine hundred thirty-nine million, three hundred seventy-nine thousand, eight".