18042900 has 72 divisors (see below), whose sum is σ = 52704960. Its totient is φ = 4765440.

The previous prime is 18042887. The next prime is 18042917. The reversal of 18042900 is 924081.

It is a congruent number.

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, 40881 + ... + 41319.

Almost surely, 2^18042900 is an apocalyptic number.

18042900 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 18042900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26352480).

18042900 is an abundant number, since it is smaller than the sum of its proper divisors (34662060).

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

18042900 is a wasteful number, since it uses less digits than its factorization.

18042900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18042900 is about 4247.6934917670. The cubic root of 18042900 is about 262.2821775777.

Adding to 18042900 its reverse (924081), we get a palindrome (18966981).

The spelling of 18042900 in words is "eighteen million, forty-two thousand, nine hundred".