18012404400 has 120 divisors (see below), whose sum is σ = 61093906704. Its totient is φ = 4520755200.

The previous prime is 18012404341. The next prime is 18012404413. The reversal of 18012404400 is 440421081.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 421081 + ... + 461880.

Almost surely, 2^18012404400 is an apocalyptic number.

18012404400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18012404400 is an abundant number, since it is smaller than the sum of its proper divisors (43081502304).

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

18012404400 is a wasteful number, since it uses less digits than its factorization.

18012404400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882999 (or 882988 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 18012404400 its reverse (440421081), we get a palindrome (18452825481).

The spelling of 18012404400 in words is "eighteen billion, twelve million, four hundred four thousand, four hundred".