18402204 has 12 divisors (see below), whose sum is σ = 42938504. Its totient is φ = 6134064.

The previous prime is 18402199. The next prime is 18402217. The reversal of 18402204 is 40220481.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×18402204² = 677282224115232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766747 + ... + 766770.

Almost surely, 2^18402204 is an apocalyptic number.

It is an amenable number.

18402204 is an abundant number, since it is smaller than the sum of its proper divisors (24536300).

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

18402204 is a wasteful number, since it uses less digits than its factorization.

18402204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533524 (or 1533522 counting only the distinct ones).

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

The square root of 18402204 is about 4289.7790152874. The cubic root of 18402204 is about 264.0117648568.

Adding to 18402204 its reverse (40220481), we get a palindrome (58622685).

The spelling of 18402204 in words is "eighteen million, four hundred two thousand, two hundred four".