18939730392 has 160 divisors (see below), whose sum is σ = 58097191680. Its totient is φ = 5716923840.

The previous prime is 18939730391. The next prime is 18939730429. The reversal of 18939730392 is 29303793981.

18939730392 is a `hidden beast` number, since 189 + 3 + 9 + 73 + 0 + 392 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939730391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1869613 + ... + 1879715.

It is an arithmetic number, because the mean of its divisors is an integer number (363107448).

Almost surely, 2^18939730392 is an apocalyptic number.

18939730392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18939730392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29048595840).

18939730392 is an abundant number, since it is smaller than the sum of its proper divisors (39157461288).

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

18939730392 is a wasteful number, since it uses less digits than its factorization.

18939730392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10395 (or 10382 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The spelling of 18939730392 in words is "eighteen billion, nine hundred thirty-nine million, seven hundred thirty thousand, three hundred ninety-two".