18315005 has 4 divisors (see below), whose sum is σ = 21978012. Its totient is φ = 14652000.

The previous prime is 18314999. The next prime is 18315013. The reversal of 18315005 is 50051381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10686361 + 7628644 = 3269^2 + 2762^2 .

It is not a de Polignac number, because 18315005 - 2⁸ = 18314749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831496 + ... + 1831505.

It is an arithmetic number, because the mean of its divisors is an integer number (5494503).

Almost surely, 2^18315005 is an apocalyptic number.

It is an amenable number.

18315005 is a deficient number, since it is larger than the sum of its proper divisors (3663007).

18315005 is an equidigital number, since it uses as much as digits as its factorization.

18315005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663006.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 18315005 is about 4279.6033694725. The cubic root of 18315005 is about 263.5940971228.

Adding to 18315005 its reverse (50051381), we get a palindrome (68366386).

The spelling of 18315005 in words is "eighteen million, three hundred fifteen thousand, five".