23638691 has 4 divisors (see below), whose sum is σ = 24188472. Its totient is φ = 23088912.

The previous prime is 23638663. The next prime is 23638711. The reversal of 23638691 is 19683632.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23638691 - 2⁶ = 23638627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23638091) 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, 274826 + ... + 274911.

It is an arithmetic number, because the mean of its divisors is an integer number (6047118).

Almost surely, 2^23638691 is an apocalyptic number.

23638691 is a deficient number, since it is larger than the sum of its proper divisors (549781).

23638691 is an equidigital number, since it uses as much as digits as its factorization.

23638691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549780.

The product of its digits is 46656, while the sum is 38.

The square root of 23638691 is about 4861.9636979311. The cubic root of 23638691 is about 286.9950951583.

The spelling of 23638691 in words is "twenty-three million, six hundred thirty-eight thousand, six hundred ninety-one".