12748865 has 4 divisors (see below), whose sum is σ = 15298644. Its totient is φ = 10199088.

The previous prime is 12748859. The next prime is 12748903. The reversal of 12748865 is 56884721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56884721 = 31 ⋅1834991.

It can be written as a sum of positive squares in 2 ways, for example, as 6558721 + 6190144 = 2561^2 + 2488^2 .

It is a cyclic number.

It is not a de Polignac number, because 12748865 - 2¹² = 12744769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274882 + ... + 1274891.

It is an arithmetic number, because the mean of its divisors is an integer number (3824661).

Almost surely, 2^12748865 is an apocalyptic number.

It is an amenable number.

12748865 is a deficient number, since it is larger than the sum of its proper divisors (2549779).

12748865 is an equidigital number, since it uses as much as digits as its factorization.

12748865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549778.

The product of its digits is 107520, while the sum is 41.

The square root of 12748865 is about 3570.5552789447. Note that the first 3 decimals coincide. The cubic root of 12748865 is about 233.6095040642.

The spelling of 12748865 in words is "twelve million, seven hundred forty-eight thousand, eight hundred sixty-five".