23868209 has 2 divisors, whose sum is σ = 23868210. Its totient is φ = 23868208.

The previous prime is 23868193. The next prime is 23868211. The reversal of 23868209 is 90286832.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15429184 + 8439025 = 3928^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 23868209 - 2⁴ = 23868193 is a prime.

It is a Sophie Germain prime.

Together with 23868211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23868269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11934104 + 11934105.

It is an arithmetic number, because the mean of its divisors is an integer number (11934105).

Almost surely, 2^23868209 is an apocalyptic number.

It is an amenable number.

23868209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23868209 is an equidigital number, since it uses as much as digits as its factorization.

23868209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 23868209 is about 4885.5101064270. The cubic root of 23868209 is about 287.9209571213.

The spelling of 23868209 in words is "twenty-three million, eight hundred sixty-eight thousand, two hundred nine".