11638765 has 4 divisors (see below), whose sum is σ = 13966524. Its totient is φ = 9311008.

The previous prime is 11638741. The next prime is 11638769. The reversal of 11638765 is 56783611.

11638765 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 3988009 + 7650756 = 1997^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 11638765 - 2²¹ = 9541613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11638769) 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, 1163872 + ... + 1163881.

It is an arithmetic number, because the mean of its divisors is an integer number (3491631).

Almost surely, 2^11638765 is an apocalyptic number.

It is an amenable number.

11638765 is a deficient number, since it is larger than the sum of its proper divisors (2327759).

11638765 is an equidigital number, since it uses as much as digits as its factorization.

11638765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327758.

The product of its digits is 30240, while the sum is 37.

The square root of 11638765 is about 3411.5634245900. The cubic root of 11638765 is about 226.6221209559.

It can be divided in two parts, 11638 and 765, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 11638765 in words is "eleven million, six hundred thirty-eight thousand, seven hundred sixty-five".