12815218 has 8 divisors (see below), whose sum is σ = 20701548. Its totient is φ = 5914704.

The previous prime is 12815207. The next prime is 12815221. The reversal of 12815218 is 81251821.

12815218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12131289 + 683929 = 3483^2 + 827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 246421 + ... + 246472.

Almost surely, 2^12815218 is an apocalyptic number.

12815218 is a deficient number, since it is larger than the sum of its proper divisors (7886330).

12815218 is a wasteful number, since it uses less digits than its factorization.

12815218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492908.

The product of its digits is 1280, while the sum is 28.

The square root of 12815218 is about 3579.8349123947. The cubic root of 12815218 is about 234.0140858884.

The spelling of 12815218 in words is "twelve million, eight hundred fifteen thousand, two hundred eighteen".