12857407 has 2 divisors, whose sum is σ = 12857408. Its totient is φ = 12857406.

The previous prime is 12857381. The next prime is 12857413. The reversal of 12857407 is 70475821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12857407 - 2⁷ = 12857279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12857107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428703 + 6428704.

It is an arithmetic number, because the mean of its divisors is an integer number (6428704).

Almost surely, 2^12857407 is an apocalyptic number.

12857407 is a deficient number, since it is larger than the sum of its proper divisors (1).

12857407 is an equidigital number, since it uses as much as digits as its factorization.

12857407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 12857407 is about 3585.7226607756. The cubic root of 12857407 is about 234.2706039836.

The spelling of 12857407 in words is "twelve million, eight hundred fifty-seven thousand, four hundred seven".