18007315 has 4 divisors (see below), whose sum is σ = 21608784. Its totient is φ = 14405848.

The previous prime is 18007303. The next prime is 18007343. The reversal of 18007315 is 51370081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18007315 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18007315.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800727 + ... + 1800736.

It is an arithmetic number, because the mean of its divisors is an integer number (5402196).

Almost surely, 2^18007315 is an apocalyptic number.

18007315 is a deficient number, since it is larger than the sum of its proper divisors (3601469).

18007315 is an equidigital number, since it uses as much as digits as its factorization.

18007315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601468.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 18007315 is about 4243.5026805694. The cubic root of 18007315 is about 262.1096359523.

Adding to 18007315 its reverse (51370081), we get a palindrome (69377396).

The spelling of 18007315 in words is "eighteen million, seven thousand, three hundred fifteen".