18399884364 has 72 divisors (see below), whose sum is σ = 47836090848. Its totient is φ = 5959008000.

The previous prime is 18399884351. The next prime is 18399884381. The reversal of 18399884364 is 46348899381.

18399884364 is a `hidden beast` number, since 183 + 9 + 98 + 8 + 4 + 364 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 958864 + ... + 977864.

Almost surely, 2^18399884364 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 18399884364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23918045424).

18399884364 is an abundant number, since it is smaller than the sum of its proper divisors (29436206484).

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

18399884364 is a wasteful number, since it uses less digits than its factorization.

18399884364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19775 (or 19770 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 63.

The spelling of 18399884364 in words is "eighteen billion, three hundred ninety-nine million, eight hundred eighty-four thousand, three hundred sixty-four".