18408380 has 12 divisors (see below), whose sum is σ = 38657640. Its totient is φ = 7363344.

The previous prime is 18408373. The next prime is 18408391. The reversal of 18408380 is 8380481.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460190 + ... + 460229.

It is an arithmetic number, because the mean of its divisors is an integer number (3221470).

Almost surely, 2^18408380 is an apocalyptic number.

18408380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18408380 is an abundant number, since it is smaller than the sum of its proper divisors (20249260).

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

18408380 is a wasteful number, since it uses less digits than its factorization.

18408380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920428 (or 920426 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 18408380 is about 4290.4988055004. The cubic root of 18408380 is about 264.0412967231.

The spelling of 18408380 in words is "eighteen million, four hundred eight thousand, three hundred eighty".