12866589 has 12 divisors (see below), whose sum is σ = 19017856. Its totient is φ = 8377992.

The previous prime is 12866573. The next prime is 12866593. The reversal of 12866589 is 98566821.

12866589 is a `hidden beast` number, since 1 + 2 + 8 + 66 + 589 = 666.

It is not a de Polignac number, because 12866589 - 2⁴ = 12866573 is a prime.

It is a super-2 number, since 2×12866589² = 331098224989842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12866599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16237 + ... + 17010.

Almost surely, 2^12866589 is an apocalyptic number.

It is an amenable number.

12866589 is a deficient number, since it is larger than the sum of its proper divisors (6151267).

12866589 is a wasteful number, since it uses less digits than its factorization.

12866589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33296 (or 33293 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 12866589 is about 3587.0027878439. The cubic root of 12866589 is about 234.3263581190.

It can be divided in two parts, 1286 and 6589, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 12866589 in words is "twelve million, eight hundred sixty-six thousand, five hundred eighty-nine".