18224400 has 60 divisors (see below), whose sum is σ = 58382672. Its totient is φ = 4859520.

The previous prime is 18224359. The next prime is 18224417. The reversal of 18224400 is 442281.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6394 + ... + 8793.

Almost surely, 2^18224400 is an apocalyptic number.

18224400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18224400 is an abundant number, since it is smaller than the sum of its proper divisors (40158272).

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

18224400 is a wasteful number, since it uses less digits than its factorization.

18224400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15208 (or 15197 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 18224400 is about 4269.0045678120. The cubic root of 18224400 is about 263.1587084887.

Adding to 18224400 its reverse (442281), we get a palindrome (18666681).

The spelling of 18224400 in words is "eighteen million, two hundred twenty-four thousand, four hundred".