23940509 has 2 divisors, whose sum is σ = 23940510. Its totient is φ = 23940508.

The previous prime is 23940503. The next prime is 23940533. The reversal of 23940509 is 90504932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23863225 + 77284 = 4885^2 + 278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23940509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23940503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11970254 + 11970255.

It is an arithmetic number, because the mean of its divisors is an integer number (11970255).

Almost surely, 2^23940509 is an apocalyptic number.

It is an amenable number.

23940509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23940509 is an equidigital number, since it uses as much as digits as its factorization.

23940509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 23940509 is about 4892.9039434675. The cubic root of 23940509 is about 288.2113811139.

The spelling of 23940509 in words is "twenty-three million, nine hundred forty thousand, five hundred nine".