11959865 has 4 divisors (see below), whose sum is σ = 14351844. Its totient is φ = 9567888.

The previous prime is 11959859. The next prime is 11959867. The reversal of 11959865 is 56895911.

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 2399401 + 9560464 = 1549^2 + 3092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11959865 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11959867) 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, 1195982 + ... + 1195991.

It is an arithmetic number, because the mean of its divisors is an integer number (3587961).

Almost surely, 2^11959865 is an apocalyptic number.

It is an amenable number.

11959865 is a deficient number, since it is larger than the sum of its proper divisors (2391979).

11959865 is an equidigital number, since it uses as much as digits as its factorization.

11959865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391978.

The product of its digits is 97200, while the sum is 44.

The square root of 11959865 is about 3458.3037749741. The cubic root of 11959865 is about 228.6873239457.

The spelling of 11959865 in words is "eleven million, nine hundred fifty-nine thousand, eight hundred sixty-five".