23656589 has 12 divisors (see below), whose sum is σ = 26163228. Its totient is φ = 21373440.

The previous prime is 23656573. The next prime is 23656601. The reversal of 23656589 is 98565632.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1800964 + 21855625 = 1342^2 + 4675^2 .

It is not a de Polignac number, because 23656589 - 2⁴ = 23656573 is a prime.

It is a super-2 number, since 2×23656589² = 1119268406229842, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23656189) 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 11 ways as a sum of consecutive naturals, for example, 22847 + ... + 23859.

It is an arithmetic number, because the mean of its divisors is an integer number (2180269).

Almost surely, 2^23656589 is an apocalyptic number.

It is an amenable number.

23656589 is a deficient number, since it is larger than the sum of its proper divisors (2506639).

23656589 is a wasteful number, since it uses less digits than its factorization.

23656589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228 (or 1217 counting only the distinct ones).

The product of its digits is 388800, while the sum is 44.

The square root of 23656589 is about 4863.8039639772. The cubic root of 23656589 is about 287.0675095228.

Adding to 23656589 its reverse (98565632), we get a palindrome (122222221).

The spelling of 23656589 in words is "twenty-three million, six hundred fifty-six thousand, five hundred eighty-nine".