23563989 has 24 divisors (see below), whose sum is σ = 36248472. Its totient is φ = 14699520.

The previous prime is 23563927. The next prime is 23564017. The reversal of 23563989 is 98936532.

23563989 is a `hidden beast` number, since 2 + 3 + 5 + 639 + 8 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6200100 + 17363889 = 2490^2 + 4167^2 .

It is not a de Polignac number, because 23563989 - 2⁸ = 23563733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23563289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35319 + ... + 35979.

It is an arithmetic number, because the mean of its divisors is an integer number (1510353).

Almost surely, 2^23563989 is an apocalyptic number.

It is an amenable number.

23563989 is a deficient number, since it is larger than the sum of its proper divisors (12684483).

23563989 is a wasteful number, since it uses less digits than its factorization.

23563989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917 (or 914 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 23563989 is about 4854.2753321170. The cubic root of 23563989 is about 286.6924595205.

The spelling of 23563989 in words is "twenty-three million, five hundred sixty-three thousand, nine hundred eighty-nine".