18399002904 has 160 divisors (see below), whose sum is σ = 55630476000. Its totient is φ = 5663927808.

The previous prime is 18399002903. The next prime is 18399002911. The reversal of 18399002904 is 40920099381.

It is a super-2 number, since 2×18399002904² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18399002904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18399002903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 410932 + ... + 453500.

It is an arithmetic number, because the mean of its divisors is an integer number (347690475).

Almost surely, 2^18399002904 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 18399002904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27815238000).

18399002904 is an abundant number, since it is smaller than the sum of its proper divisors (37231473096).

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

18399002904 is a wasteful number, since it uses less digits than its factorization.

18399002904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42639 (or 42626 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 18399002904 in words is "eighteen billion, three hundred ninety-nine million, two thousand, nine hundred four".