18404080 has 80 divisors (see below), whose sum is σ = 45497088. Its totient is φ = 6912000.

The previous prime is 18404041. The next prime is 18404083. The reversal of 18404080 is 8040481.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404083) by changing a digit.

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, 101590 + ... + 101770.

Almost surely, 2^18404080 is an apocalyptic number.

18404080 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 18404080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22748544).

18404080 is an abundant number, since it is smaller than the sum of its proper divisors (27093008).

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

18404080 is a wasteful number, since it uses less digits than its factorization.

18404080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 18404080 is about 4289.9976689970. The cubic root of 18404080 is about 264.0207360511.

The spelling of 18404080 in words is "eighteen million, four hundred four thousand, eighty".