18039542400 has 1344 divisors, whose sum is σ = 78798304800. Its totient is φ = 4031078400.

The previous prime is 18039542369. The next prime is 18039542441. The reversal of 18039542400 is 424593081.

18039542400 is a `hidden beast` number, since 1 + 80 + 39 + 542 + 4 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 487555182 + ... + 487555218.

Almost surely, 2^18039542400 is an apocalyptic number.

18039542400 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 18039542400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39399152400).

18039542400 is an abundant number, since it is smaller than the sum of its proper divisors (60758762400).

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

18039542400 is a wasteful number, since it uses less digits than its factorization.

18039542400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 18039542400 in words is "eighteen billion, thirty-nine million, five hundred forty-two thousand, four hundred".