18385880 has 16 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 7354336.

The previous prime is 18385879. The next prime is 18385889. The reversal of 18385880 is 8858381.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18385889) 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 3 ways as a sum of consecutive naturals, for example, 229784 + ... + 229863.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^18385880 is an apocalyptic number.

18385880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18385880 is an abundant number, since it is smaller than the sum of its proper divisors (22982440).

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

18385880 is a wasteful number, since it uses less digits than its factorization.

18385880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459658 (or 459654 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The square root of 18385880 is about 4287.8759310409. The cubic root of 18385880 is about 263.9336763297.

The spelling of 18385880 in words is "eighteen million, three hundred eighty-five thousand, eight hundred eighty".