18238404 has 48 divisors (see below), whose sum is σ = 45158400. Its totient is φ = 5713056.

The previous prime is 18238387. The next prime is 18238411. The reversal of 18238404 is 40483281.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37837 + ... + 38315.

It is an arithmetic number, because the mean of its divisors is an integer number (940800).

Almost surely, 2^18238404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18238404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22579200).

18238404 is an abundant number, since it is smaller than the sum of its proper divisors (26919996).

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

18238404 is a wasteful number, since it uses less digits than its factorization.

18238404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 18238404 is about 4270.6444478556. The cubic root of 18238404 is about 263.2260967340.

The spelling of 18238404 in words is "eighteen million, two hundred thirty-eight thousand, four hundred four".