18138306 has 16 divisors (see below), whose sum is σ = 37854144. Its totient is φ = 5783184.

The previous prime is 18138247. The next prime is 18138343. The reversal of 18138306 is 60383181.

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, 65581 + ... + 65856.

It is an arithmetic number, because the mean of its divisors is an integer number (2365884).

Almost surely, 2^18138306 is an apocalyptic number.

18138306 is an abundant number, since it is smaller than the sum of its proper divisors (19715838).

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

18138306 is a wasteful number, since it uses less digits than its factorization.

18138306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131465.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18138306 is about 4258.9090152291. The cubic root of 18138306 is about 262.7436576624.

The spelling of 18138306 in words is "eighteen million, one hundred thirty-eight thousand, three hundred six".