23663729 has 2 divisors, whose sum is σ = 23663730. Its totient is φ = 23663728.

The previous prime is 23663723. The next prime is 23663741. The reversal of 23663729 is 92736632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 1385329 = 4720^2 + 1177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23663729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23663692 and 23663701.

It is not a weakly prime, because it can be changed into another prime (23663723) 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, 11831864 + 11831865.

It is an arithmetic number, because the mean of its divisors is an integer number (11831865).

Almost surely, 2^23663729 is an apocalyptic number.

It is an amenable number.

23663729 is a deficient number, since it is larger than the sum of its proper divisors (1).

23663729 is an equidigital number, since it uses as much as digits as its factorization.

23663729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 38.

The square root of 23663729 is about 4864.5379020006. The cubic root of 23663729 is about 287.0963873948.

The spelling of 23663729 in words is "twenty-three million, six hundred sixty-three thousand, seven hundred twenty-nine".