12815243 has 4 divisors (see below), whose sum is σ = 14646000. Its totient is φ = 10984488.

The previous prime is 12815237. The next prime is 12815249. The reversal of 12815243 is 34251821.

12815243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34251821 = 17 ⋅2014813.

It is an interprime number because it is at equal distance from previous prime (12815237) and next prime (12815249).

It is a cyclic number.

It is not a de Polignac number, because 12815243 - 2⁴ = 12815227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12815249) 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, 915368 + ... + 915381.

It is an arithmetic number, because the mean of its divisors is an integer number (3661500).

Almost surely, 2^12815243 is an apocalyptic number.

12815243 is a deficient number, since it is larger than the sum of its proper divisors (1830757).

12815243 is an equidigital number, since it uses as much as digits as its factorization.

12815243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830756.

The product of its digits is 1920, while the sum is 26.

The square root of 12815243 is about 3579.8384041741. The cubic root of 12815243 is about 234.0142380603.

The spelling of 12815243 in words is "twelve million, eight hundred fifteen thousand, two hundred forty-three".