13865765 has 4 divisors (see below), whose sum is σ = 16638924. Its totient is φ = 11092608.

The previous prime is 13865759. The next prime is 13865779. The reversal of 13865765 is 56756831.

13865765 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: 56756831 = 1433 ⋅39607.

It can be written as a sum of positive squares in 2 ways, for example, as 7745089 + 6120676 = 2783^2 + 2474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13865765 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 1386572 + ... + 1386581.

It is an arithmetic number, because the mean of its divisors is an integer number (4159731).

Almost surely, 2^13865765 is an apocalyptic number.

It is an amenable number.

13865765 is a deficient number, since it is larger than the sum of its proper divisors (2773159).

13865765 is an equidigital number, since it uses as much as digits as its factorization.

13865765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773158.

The product of its digits is 151200, while the sum is 41.

The square root of 13865765 is about 3723.6762748660. The cubic root of 13865765 is about 240.2414526064.

The spelling of 13865765 in words is "thirteen million, eight hundred sixty-five thousand, seven hundred sixty-five".