11639765 has 4 divisors (see below), whose sum is σ = 13967724. Its totient is φ = 9311808.

The previous prime is 11639741. The next prime is 11639767. The reversal of 11639765 is 56793611.

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 1540081 + 10099684 = 1241^2 + 3178^2 .

It is a cyclic number.

It is not a de Polignac number, because 11639765 - 2¹⁰ = 11638741 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 (11639767) 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, 1163972 + ... + 1163981.

It is an arithmetic number, because the mean of its divisors is an integer number (3491931).

Almost surely, 2^11639765 is an apocalyptic number.

It is an amenable number.

11639765 is a deficient number, since it is larger than the sum of its proper divisors (2327959).

11639765 is an equidigital number, since it uses as much as digits as its factorization.

11639765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327958.

The product of its digits is 34020, while the sum is 38.

The square root of 11639765 is about 3411.7099818126. The cubic root of 11639765 is about 226.6286112102.

The spelling of 11639765 in words is "eleven million, six hundred thirty-nine thousand, seven hundred sixty-five".