12400397 has 2 divisors, whose sum is σ = 12400398. Its totient is φ = 12400396.

The previous prime is 12400387. The next prime is 12400441. The reversal of 12400397 is 79300421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9066121 + 3334276 = 3011^2 + 1826^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12400397 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 (12400387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200198 + 6200199.

It is an arithmetic number, because the mean of its divisors is an integer number (6200199).

Almost surely, 2^12400397 is an apocalyptic number.

It is an amenable number.

12400397 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400397 is an equidigital number, since it uses as much as digits as its factorization.

12400397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 12400397 is about 3521.4197420927. The cubic root of 12400397 is about 231.4613755656.

The spelling of 12400397 in words is "twelve million, four hundred thousand, three hundred ninety-seven".