23617989 has 12 divisors (see below), whose sum is σ = 34294156. Its totient is φ = 15662592.

The previous prime is 23617961. The next prime is 23617991. The reversal of 23617989 is 98971632.

23617989 is a `hidden beast` number, since 23 + 617 + 9 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3744225 + 19873764 = 1935^2 + 4458^2 .

It is not a de Polignac number, because 23617989 - 2²⁰ = 22569413 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 (23617949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5062 + ... + 8535.

Almost surely, 2^23617989 is an apocalyptic number.

It is an amenable number.

23617989 is a deficient number, since it is larger than the sum of its proper divisors (10676167).

23617989 is a wasteful number, since it uses less digits than its factorization.

23617989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13796 (or 13793 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 23617989 is about 4859.8342564330. The cubic root of 23617989 is about 286.9112903525.

It can be divided in two parts, 236 and 17989, that added together give a square (18225 = 135²).

The spelling of 23617989 in words is "twenty-three million, six hundred seventeen thousand, nine hundred eighty-nine".