23638985 has 4 divisors (see below), whose sum is σ = 28366788. Its totient is φ = 18911184.

The previous prime is 23638969. The next prime is 23638987. The reversal of 23638985 is 58983632.

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 18567481 + 5071504 = 4309^2 + 2252^2 .

It is a cyclic number.

It is not a de Polignac number, because 23638985 - 2⁴ = 23638969 is a prime.

It is a super-2 number, since 2×23638985² = 1117603223660450, 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 not an unprimeable number, because it can be changed into a prime (23638987) 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 3 ways as a sum of consecutive naturals, for example, 2363894 + ... + 2363903.

It is an arithmetic number, because the mean of its divisors is an integer number (7091697).

Almost surely, 2^23638985 is an apocalyptic number.

It is an amenable number.

23638985 is a deficient number, since it is larger than the sum of its proper divisors (4727803).

23638985 is an equidigital number, since it uses as much as digits as its factorization.

23638985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4727802.

The product of its digits is 311040, while the sum is 44.

The square root of 23638985 is about 4861.9939325343. The cubic root of 23638985 is about 286.9962849620.

The spelling of 23638985 in words is "twenty-three million, six hundred thirty-eight thousand, nine hundred eighty-five".