18399405888 has 336 divisors, whose sum is σ = 56297779200. Its totient is φ = 5736407040.

The previous prime is 18399405863. The next prime is 18399405889. The reversal of 18399405888 is 88850499381.

It is a happy number.

18399405888 is a `hidden beast` number, since 1 + 8 + 3 + 9 + 9 + 40 + 588 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18399405889) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96331873 + ... + 96332063.

Almost surely, 2^18399405888 is an apocalyptic number.

18399405888 is a gapful number since it is divisible by the number (18) 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 18399405888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28148889600).

18399405888 is an abundant number, since it is smaller than the sum of its proper divisors (37898373312).

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

18399405888 is a wasteful number, since it uses less digits than its factorization.

18399405888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 18399405888 in words is "eighteen billion, three hundred ninety-nine million, four hundred five thousand, eight hundred eighty-eight".