12638309 has 2 divisors, whose sum is σ = 12638310. Its totient is φ = 12638308.

The previous prime is 12638273. The next prime is 12638333. The reversal of 12638309 is 90383621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10956100 + 1682209 = 3310^2 + 1297^2 .

It is an emirp because it is prime and its reverse (90383621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12638309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319154 + 6319155.

It is an arithmetic number, because the mean of its divisors is an integer number (6319155).

Almost surely, 2^12638309 is an apocalyptic number.

It is an amenable number.

12638309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638309 is an equidigital number, since it uses as much as digits as its factorization.

12638309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 12638309 is about 3555.0399435168. The cubic root of 12638309 is about 232.9322686218.

The spelling of 12638309 in words is "twelve million, six hundred thirty-eight thousand, three hundred nine".