23640109 has 2 divisors, whose sum is σ = 23640110. Its totient is φ = 23640108.

The previous prime is 23640083. The next prime is 23640121. The reversal of 23640109 is 90104632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19166884 + 4473225 = 4378^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 23640109 - 2⁹ = 23639597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23640209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11820054 + 11820055.

It is an arithmetic number, because the mean of its divisors is an integer number (11820055).

Almost surely, 2^23640109 is an apocalyptic number.

It is an amenable number.

23640109 is a deficient number, since it is larger than the sum of its proper divisors (1).

23640109 is an equidigital number, since it uses as much as digits as its factorization.

23640109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 23640109 is about 4862.1095215966. The cubic root of 23640109 is about 287.0008336445. Note that the first 3 decimals are identical.

The spelling of 23640109 in words is "twenty-three million, six hundred forty thousand, one hundred nine".