18384138 has 16 divisors (see below), whose sum is σ = 40853760. Its totient is φ = 6128028.

The previous prime is 18384127. The next prime is 18384151. The reversal of 18384138 is 83148381.

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, 170170 + ... + 170277.

It is an arithmetic number, because the mean of its divisors is an integer number (2553360).

Almost surely, 2^18384138 is an apocalyptic number.

18384138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18384138 is an abundant number, since it is smaller than the sum of its proper divisors (22469622).

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

18384138 is a wasteful number, since it uses less digits than its factorization.

18384138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340458 (or 340452 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18384138 is about 4287.6727953518. The cubic root of 18384138 is about 263.9253404584.

The spelling of 18384138 in words is "eighteen million, three hundred eighty-four thousand, one hundred thirty-eight".