18404380 has 12 divisors (see below), whose sum is σ = 38649240. Its totient is φ = 7361744.

The previous prime is 18404341. The next prime is 18404383. The reversal of 18404380 is 8340481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460090 + ... + 460129.

It is an arithmetic number, because the mean of its divisors is an integer number (3220770).

Almost surely, 2^18404380 is an apocalyptic number.

18404380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18404380 is an abundant number, since it is smaller than the sum of its proper divisors (20244860).

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

18404380 is a wasteful number, since it uses less digits than its factorization.

18404380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920228 (or 920226 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 18404380 is about 4290.0326339085. The cubic root of 18404380 is about 264.0221706205.

The spelling of 18404380 in words is "eighteen million, four hundred four thousand, three hundred eighty".