23438309 has 2 divisors, whose sum is σ = 23438310. Its totient is φ = 23438308.

The previous prime is 23438269. The next prime is 23438321. The reversal of 23438309 is 90383432.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 494209 = 4790^2 + 703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23438309 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 (23438339) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11719154 + 11719155.

It is an arithmetic number, because the mean of its divisors is an integer number (11719155).

Almost surely, 2^23438309 is an apocalyptic number.

It is an amenable number.

23438309 is a deficient number, since it is larger than the sum of its proper divisors (1).

23438309 is an equidigital number, since it uses as much as digits as its factorization.

23438309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 23438309 is about 4841.3127351990. The cubic root of 23438309 is about 286.1818533074.

The spelling of 23438309 in words is "twenty-three million, four hundred thirty-eight thousand, three hundred nine".