12913865 has 4 divisors (see below), whose sum is σ = 15496644. Its totient is φ = 10331088.

The previous prime is 12913853. The next prime is 12913867. The reversal of 12913865 is 56831921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56831921 = 2389 ⋅23789.

It can be written as a sum of positive squares in 2 ways, for example, as 10214416 + 2699449 = 3196^2 + 1643^2 .

It is a cyclic number.

It is not a de Polignac number, because 12913865 - 2⁶ = 12913801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12913867) 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, 1291382 + ... + 1291391.

It is an arithmetic number, because the mean of its divisors is an integer number (3874161).

Almost surely, 2^12913865 is an apocalyptic number.

It is an amenable number.

12913865 is a deficient number, since it is larger than the sum of its proper divisors (2582779).

12913865 is an equidigital number, since it uses as much as digits as its factorization.

12913865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582778.

The product of its digits is 12960, while the sum is 35.

The square root of 12913865 is about 3593.5866484614. The cubic root of 12913865 is about 234.6130042137.

The spelling of 12913865 in words is "twelve million, nine hundred thirteen thousand, eight hundred sixty-five".