12318505 has 4 divisors (see below), whose sum is σ = 14782212. Its totient is φ = 9854800.

The previous prime is 12318503. The next prime is 12318529. The reversal of 12318505 is 50581321.

It is a happy number.

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 5285401 + 7033104 = 2299^2 + 2652^2 .

It is not a de Polignac number, because 12318505 - 2¹ = 12318503 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 12318505.

It is not an unprimeable number, because it can be changed into a prime (12318503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1231846 + ... + 1231855.

It is an arithmetic number, because the mean of its divisors is an integer number (3695553).

Almost surely, 2^12318505 is an apocalyptic number.

It is an amenable number.

12318505 is a deficient number, since it is larger than the sum of its proper divisors (2463707).

12318505 is an equidigital number, since it uses as much as digits as its factorization.

12318505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463706.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 12318505 is about 3509.7727846685. The cubic root of 12318505 is about 230.9507275455.

Adding to 12318505 its reverse (50581321), we get a palindrome (62899826).

The spelling of 12318505 in words is "twelve million, three hundred eighteen thousand, five hundred five".