11865589 has 4 divisors (see below), whose sum is σ = 11941324. Its totient is φ = 11789856.

The previous prime is 11865577. The next prime is 11865593. The reversal of 11865589 is 98556811.

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 3062500 + 8803089 = 1750^2 + 2967^2 .

It is a cyclic number.

It is not a de Polignac number, because 11865589 - 2⁷ = 11865461 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 (11865509) 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, 37632 + ... + 37945.

It is an arithmetic number, because the mean of its divisors is an integer number (2985331).

Almost surely, 2^11865589 is an apocalyptic number.

It is an amenable number.

11865589 is a deficient number, since it is larger than the sum of its proper divisors (75735).

11865589 is an equidigital number, since it uses as much as digits as its factorization.

11865589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75734.

The product of its digits is 86400, while the sum is 43.

The square root of 11865589 is about 3444.6464259776. The cubic root of 11865589 is about 228.0848471020.

The spelling of 11865589 in words is "eleven million, eight hundred sixty-five thousand, five hundred eighty-nine".