11523865 has 4 divisors (see below), whose sum is σ = 13828644. Its totient is φ = 9219088.

The previous prime is 11523857. The next prime is 11523877. The reversal of 11523865 is 56832511.

11523865 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, and also an emirpimes, since its reverse is a distinct semiprime: 56832511 = 389 ⋅146099.

It can be written as a sum of positive squares in 2 ways, for example, as 1814409 + 9709456 = 1347^2 + 3116^2 .

It is a cyclic number.

It is not a de Polignac number, because 11523865 - 2³ = 11523857 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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, 1152382 + ... + 1152391.

It is an arithmetic number, because the mean of its divisors is an integer number (3457161).

Almost surely, 2^11523865 is an apocalyptic number.

It is an amenable number.

11523865 is a deficient number, since it is larger than the sum of its proper divisors (2304779).

11523865 is an equidigital number, since it uses as much as digits as its factorization.

11523865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304778.

The product of its digits is 7200, while the sum is 31.

The square root of 11523865 is about 3394.6818702199. The cubic root of 11523865 is about 225.8739017757.

The spelling of 11523865 in words is "eleven million, five hundred twenty-three thousand, eight hundred sixty-five".