23639989 has 4 divisors (see below), whose sum is σ = 23728140. Its totient is φ = 23551840.

The previous prime is 23639969. The next prime is 23639999. The reversal of 23639989 is 98993632.

It is a happy number.

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 8076964 + 15563025 = 2842^2 + 3945^2 .

It is a cyclic number.

It is not a de Polignac number, because 23639989 - 2¹¹ = 23637941 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23639969) 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, 43672 + ... + 44209.

It is an arithmetic number, because the mean of its divisors is an integer number (5932035).

Almost surely, 2^23639989 is an apocalyptic number.

It is an amenable number.

23639989 is a deficient number, since it is larger than the sum of its proper divisors (88151).

23639989 is an equidigital number, since it uses as much as digits as its factorization.

23639989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88150.

The product of its digits is 629856, while the sum is 49.

The square root of 23639989 is about 4862.0971812583. The cubic root of 23639989 is about 287.0003480270. Note that the first 3 decimals are identical.

The spelling of 23639989 in words is "twenty-three million, six hundred thirty-nine thousand, nine hundred eighty-nine".