23688809 has 2 divisors, whose sum is σ = 23688810. Its totient is φ = 23688808.

The previous prime is 23688751. The next prime is 23688811. The reversal of 23688809 is 90888632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 4853209 = 4340^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 23688809 - 2¹⁶ = 23623273 is a prime.

It is a super-2 number, since 2×23688809² = 1122319343676962, which contains 22 as substring.

Together with 23688811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23688809.

It is not a weakly prime, because it can be changed into another prime (23688869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11844404 + 11844405.

It is an arithmetic number, because the mean of its divisors is an integer number (11844405).

Almost surely, 2^23688809 is an apocalyptic number.

It is an amenable number.

23688809 is a deficient number, since it is larger than the sum of its proper divisors (1).

23688809 is an equidigital number, since it uses as much as digits as its factorization.

23688809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 23688809 is about 4867.1150592522. The cubic root of 23688809 is about 287.1977779395.

The spelling of 23688809 in words is "twenty-three million, six hundred eighty-eight thousand, eight hundred nine".