12857279 has 2 divisors, whose sum is σ = 12857280. Its totient is φ = 12857278.

The previous prime is 12857267. The next prime is 12857297. The reversal of 12857279 is 97275821.

Together with next prime (12857297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12857279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12857209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428639 + 6428640.

It is an arithmetic number, because the mean of its divisors is an integer number (6428640).

Almost surely, 2^12857279 is an apocalyptic number.

12857279 is a deficient number, since it is larger than the sum of its proper divisors (1).

12857279 is an equidigital number, since it uses as much as digits as its factorization.

12857279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 12857279 is about 3585.7048121673. The cubic root of 12857279 is about 234.2698265656.

The spelling of 12857279 in words is "twelve million, eight hundred fifty-seven thousand, two hundred seventy-nine".