23399729 has 2 divisors, whose sum is σ = 23399730. Its totient is φ = 23399728.

The previous prime is 23399711. The next prime is 23399731. The reversal of 23399729 is 92799332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19891600 + 3508129 = 4460^2 + 1873^2 .

It is a cyclic number.

It is not a de Polignac number, because 23399729 - 2⁸ = 23399473 is a prime.

Together with 23399731, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23399729.

It is not a weakly prime, because it can be changed into another prime (23399759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11699864 + 11699865.

It is an arithmetic number, because the mean of its divisors is an integer number (11699865).

Almost surely, 2^23399729 is an apocalyptic number.

It is an amenable number.

23399729 is a deficient number, since it is larger than the sum of its proper divisors (1).

23399729 is an equidigital number, since it uses as much as digits as its factorization.

23399729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 44.

The square root of 23399729 is about 4837.3266377205. The cubic root of 23399729 is about 286.0247464202.

The spelling of 23399729 in words is "twenty-three million, three hundred ninety-nine thousand, seven hundred twenty-nine".