23509399 has 2 divisors, whose sum is σ = 23509400. Its totient is φ = 23509398.

The previous prime is 23509397. The next prime is 23509411. The reversal of 23509399 is 99390532.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23509399 - 2¹ = 23509397 is a prime.

Together with 23509397, 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 (23509397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11754699 + 11754700.

It is an arithmetic number, because the mean of its divisors is an integer number (11754700).

Almost surely, 2^23509399 is an apocalyptic number.

23509399 is a deficient number, since it is larger than the sum of its proper divisors (1).

23509399 is an equidigital number, since it uses as much as digits as its factorization.

23509399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 40.

The square root of 23509399 is about 4848.6491933321. The cubic root of 23509399 is about 286.4708976751.

The spelling of 23509399 in words is "twenty-three million, five hundred nine thousand, three hundred ninety-nine".