12399397 has 2 divisors, whose sum is σ = 12399398. Its totient is φ = 12399396.

The previous prime is 12399383. The next prime is 12399407. The reversal of 12399397 is 79399321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8014561 + 4384836 = 2831^2 + 2094^2 .

It is a cyclic number.

It is not a de Polignac number, because 12399397 - 2¹⁹ = 11875109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12399347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6199698 + 6199699.

It is an arithmetic number, because the mean of its divisors is an integer number (6199699).

Almost surely, 2^12399397 is an apocalyptic number.

It is an amenable number.

12399397 is a deficient number, since it is larger than the sum of its proper divisors (1).

12399397 is an equidigital number, since it uses as much as digits as its factorization.

12399397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 43.

The square root of 12399397 is about 3521.2777510444. The cubic root of 12399397 is about 231.4551535176.

The spelling of 12399397 in words is "twelve million, three hundred ninety-nine thousand, three hundred ninety-seven".