18404420 has 24 divisors (see below), whose sum is σ = 39118464. Its totient is φ = 7272416.

The previous prime is 18404383. The next prime is 18404453. The reversal of 18404420 is 2440481.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3884 + ... + 7203.

It is an arithmetic number, because the mean of its divisors is an integer number (1629936).

Almost surely, 2^18404420 is an apocalyptic number.

18404420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18404420 is an abundant number, since it is smaller than the sum of its proper divisors (20714044).

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

18404420 is a wasteful number, since it uses less digits than its factorization.

18404420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11179 (or 11177 counting only the distinct ones).

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

The square root of 18404420 is about 4290.0372958752. The cubic root of 18404420 is about 264.0223618952.

The spelling of 18404420 in words is "eighteen million, four hundred four thousand, four hundred twenty".