12538865 has 4 divisors (see below), whose sum is σ = 15046644. Its totient is φ = 10031088.

The previous prime is 12538831. The next prime is 12538873. The reversal of 12538865 is 56883521.

12538865 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 9138529 + 3400336 = 3023^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 12538865 - 2⁸ = 12538609 is a prime.

It is a Duffinian number.

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, 1253882 + ... + 1253891.

It is an arithmetic number, because the mean of its divisors is an integer number (3761661).

Almost surely, 2^12538865 is an apocalyptic number.

It is an amenable number.

12538865 is a deficient number, since it is larger than the sum of its proper divisors (2507779).

12538865 is an equidigital number, since it uses as much as digits as its factorization.

12538865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507778.

The product of its digits is 57600, while the sum is 38.

The square root of 12538865 is about 3541.0259812659. The cubic root of 12538865 is about 232.3197199614.

The spelling of 12538865 in words is "twelve million, five hundred thirty-eight thousand, eight hundred sixty-five".