12400669 has 2 divisors, whose sum is σ = 12400670. Its totient is φ = 12400668.

The previous prime is 12400643. The next prime is 12400691. The reversal of 12400669 is 96600421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 1077444 = 3365^2 + 1038^2 .

It is a cyclic number.

It is not a de Polignac number, because 12400669 - 2⁷ = 12400541 is a prime.

It is a super-2 number, since 2×12400669² = 307553183295122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12400699) 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, 6200334 + 6200335.

It is an arithmetic number, because the mean of its divisors is an integer number (6200335).

Almost surely, 2^12400669 is an apocalyptic number.

It is an amenable number.

12400669 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400669 is an equidigital number, since it uses as much as digits as its factorization.

12400669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 12400669 is about 3521.4583626674. The cubic root of 12400669 is about 231.4630679048.

The spelling of 12400669 in words is "twelve million, four hundred thousand, six hundred sixty-nine".