12913765 has 4 divisors (see below), whose sum is σ = 15496524. Its totient is φ = 10331008.

The previous prime is 12913751. The next prime is 12913783. The reversal of 12913765 is 56731921.

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 8579041 + 4334724 = 2929^2 + 2082^2 .

It is a cyclic number.

It is not a de Polignac number, because 12913765 - 2⁹ = 12913253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12913765.

It is a congruent 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, 1291372 + ... + 1291381.

It is an arithmetic number, because the mean of its divisors is an integer number (3874131).

Almost surely, 2^12913765 is an apocalyptic number.

It is an amenable number.

12913765 is a deficient number, since it is larger than the sum of its proper divisors (2582759).

12913765 is an equidigital number, since it uses as much as digits as its factorization.

12913765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582758.

The product of its digits is 11340, while the sum is 34.

The square root of 12913765 is about 3593.5727347585. The cubic root of 12913765 is about 234.6123986279.

The spelling of 12913765 in words is "twelve million, nine hundred thirteen thousand, seven hundred sixty-five".