23984509 has 2 divisors, whose sum is σ = 23984510. Its totient is φ = 23984508.

The previous prime is 23984507. The next prime is 23984531. The reversal of 23984509 is 90548932.

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., 21252100 + 2732409 = 4610^2 + 1653^2 .

It is a cyclic number.

It is not a de Polignac number, because 23984509 - 2¹ = 23984507 is a prime.

Together with 23984507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23984507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11992254 + 11992255.

It is an arithmetic number, because the mean of its divisors is an integer number (11992255).

Almost surely, 2^23984509 is an apocalyptic number.

It is an amenable number.

23984509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23984509 is an equidigital number, since it uses as much as digits as its factorization.

23984509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 23984509 is about 4897.3981867927. The cubic root of 23984509 is about 288.3878399039.

It can be divided in two parts, 239 and 84509, that added together give a palindrome (84748).

The spelling of 23984509 in words is "twenty-three million, nine hundred eighty-four thousand, five hundred nine".