12397309 has 2 divisors, whose sum is σ = 12397310. Its totient is φ = 12397308.

The previous prime is 12397289. The next prime is 12397313. The reversal of 12397309 is 90379321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12040900 + 356409 = 3470^2 + 597^2 .

It is a cyclic number.

It is not a de Polignac number, because 12397309 - 2⁵ = 12397277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12397379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6198654 + 6198655.

It is an arithmetic number, because the mean of its divisors is an integer number (6198655).

Almost surely, 2^12397309 is an apocalyptic number.

It is an amenable number.

12397309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12397309 is an equidigital number, since it uses as much as digits as its factorization.

12397309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 12397309 is about 3520.9812552753. The cubic root of 12397309 is about 231.4421608027.

The spelling of 12397309 in words is "twelve million, three hundred ninety-seven thousand, three hundred nine".