18009315 has 12 divisors (see below), whose sum is σ = 31216224. Its totient is φ = 9604944.

The previous prime is 18009289. The next prime is 18009323. The reversal of 18009315 is 51390081.

It is not a de Polignac number, because 18009315 - 2⁸ = 18009059 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200059 + ... + 200148.

It is an arithmetic number, because the mean of its divisors is an integer number (2601352).

Almost surely, 2^18009315 is an apocalyptic number.

18009315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18009315 is a deficient number, since it is larger than the sum of its proper divisors (13206909).

18009315 is a wasteful number, since it uses less digits than its factorization.

18009315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400218 (or 400215 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 18009315 is about 4243.7383284081. The cubic root of 18009315 is about 262.1193394138.

Adding to 18009315 its reverse (51390081), we get a palindrome (69399396).

The spelling of 18009315 in words is "eighteen million, nine thousand, three hundred fifteen".