18404000 has 96 divisors (see below), whose sum is σ = 46702656. Its totient is φ = 7123200.

The previous prime is 18403999. The next prime is 18404021. The reversal of 18404000 is 40481.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18404000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171947 + ... + 172053.

It is an arithmetic number, because the mean of its divisors is an integer number (486486).

Almost surely, 2^18404000 is an apocalyptic number.

18404000 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 18404000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23351328).

18404000 is an abundant number, since it is smaller than the sum of its proper divisors (28298656).

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

18404000 is a wasteful number, since it uses less digits than its factorization.

18404000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 18404000 is about 4289.9883449725. The cubic root of 18404000 is about 264.0203534966.

Adding to 18404000 its reverse (40481), we get a palindrome (18444481).

The spelling of 18404000 in words is "eighteen million, four hundred four thousand".