23649809 has 2 divisors, whose sum is σ = 23649810. Its totient is φ = 23649808.

The previous prime is 23649797. The next prime is 23649827. The reversal of 23649809 is 90894632.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 6864400 = 4097^2 + 2620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23649809 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23649209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11824904 + 11824905.

It is an arithmetic number, because the mean of its divisors is an integer number (11824905).

Almost surely, 2^23649809 is an apocalyptic number.

It is an amenable number.

23649809 is a deficient number, since it is larger than the sum of its proper divisors (1).

23649809 is an equidigital number, since it uses as much as digits as its factorization.

23649809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 23649809 is about 4863.1069287031. The cubic root of 23649809 is about 287.0400822990.

The spelling of 23649809 in words is "twenty-three million, six hundred forty-nine thousand, eight hundred nine".