18404204 has 72 divisors (see below), whose sum is σ = 41827968. Its totient is φ = 7015680.

The previous prime is 18404201. The next prime is 18404219. The reversal of 18404204 is 40240481.

It is a self number, because there is not a number n which added to its sum of digits gives 18404204.

It is not an unprimeable number, because it can be changed into a prime (18404201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78872 + ... + 79104.

It is an arithmetic number, because the mean of its divisors is an integer number (580944).

Almost surely, 2^18404204 is an apocalyptic number.

18404204 is a gapful number since it is divisible by the number (14) 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 18404204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20913984).

18404204 is an abundant number, since it is smaller than the sum of its proper divisors (23423764).

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

18404204 is a wasteful number, since it uses less digits than its factorization.

18404204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18404204 is about 4290.0121211950. The cubic root of 18404204 is about 264.0213290083.

Adding to 18404204 its reverse (40240481), we get a palindrome (58644685).

The spelling of 18404204 in words is "eighteen million, four hundred four thousand, two hundred four".