18338918400 has 936 divisors, whose sum is σ = 75420631104. Its totient is φ = 4379443200.

The previous prime is 18338918383. The next prime is 18338918459. The reversal of 18338918400 is 481983381.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 273715167 + ... + 273715233.

Almost surely, 2^18338918400 is an apocalyptic number.

18338918400 is a gapful number since it is divisible by the number (10) 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 18338918400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37710315552).

18338918400 is an abundant number, since it is smaller than the sum of its proper divisors (57081712704).

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

18338918400 is an equidigital number, since it uses as much as digits as its factorization.

18338918400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 18338918400 in words is "eighteen billion, three hundred thirty-eight million, nine hundred eighteen thousand, four hundred".