11789865 has 48 divisors (see below), whose sum is σ = 21494928. Its totient is φ = 5971968.

The previous prime is 11789849. The next prime is 11789867. The reversal of 11789865 is 56898711.

It can be written as a sum of positive squares in 8 ways, for example, as 318096 + 11471769 = 564^2 + 3387^2 .

It is not a de Polignac number, because 11789865 - 2⁴ = 11789849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11789865.

It is not an unprimeable number, because it can be changed into a prime (11789867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121497 + ... + 121593.

It is an arithmetic number, because the mean of its divisors is an integer number (447811).

Almost surely, 2^11789865 is an apocalyptic number.

11789865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11789865 is a deficient number, since it is larger than the sum of its proper divisors (9705063).

11789865 is a wasteful number, since it uses less digits than its factorization.

11789865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 215 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 11789865 is about 3433.6372842803. The cubic root of 11789865 is about 227.5986128057.

The spelling of 11789865 in words is "eleven million, seven hundred eighty-nine thousand, eight hundred sixty-five".