12915815 has 8 divisors (see below), whose sum is σ = 16908048. Its totient is φ = 9393280.

The previous prime is 12915803. The next prime is 12915821. The reversal of 12915815 is 51851921.

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

It is not a de Polignac number, because 12915815 - 2⁶ = 12915751 is a prime.

It is a super-2 number, since 2×12915815² = 333636554228450, which contains 22 as substring.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117362 + ... + 117471.

It is an arithmetic number, because the mean of its divisors is an integer number (2113506).

Almost surely, 2^12915815 is an apocalyptic number.

12915815 is a deficient number, since it is larger than the sum of its proper divisors (3992233).

12915815 is a wasteful number, since it uses less digits than its factorization.

12915815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234849.

The product of its digits is 3600, while the sum is 32.

The square root of 12915815 is about 3593.8579549003. The cubic root of 12915815 is about 234.6248125126.

The spelling of 12915815 in words is "twelve million, nine hundred fifteen thousand, eight hundred fifteen".