23638309 has 2 divisors, whose sum is σ = 23638310. Its totient is φ = 23638308.

The previous prime is 23638297. The next prime is 23638327. The reversal of 23638309 is 90383632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19448100 + 4190209 = 4410^2 + 2047^2 .

It is a cyclic number.

It is not a de Polignac number, because 23638309 - 2¹⁵ = 23605541 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23638339) 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, 11819154 + 11819155.

It is an arithmetic number, because the mean of its divisors is an integer number (11819155).

Almost surely, 2^23638309 is an apocalyptic number.

It is an amenable number.

23638309 is a deficient number, since it is larger than the sum of its proper divisors (1).

23638309 is an equidigital number, since it uses as much as digits as its factorization.

23638309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 23638309 is about 4861.9244132339. The cubic root of 23638309 is about 286.9935492081.

The spelling of 23638309 in words is "twenty-three million, six hundred thirty-eight thousand, three hundred nine".