12857347 has 2 divisors, whose sum is σ = 12857348. Its totient is φ = 12857346.

The previous prime is 12857333. The next prime is 12857381. The reversal of 12857347 is 74375821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12857347 is a prime.

It is a super-2 number, since 2×12857347² = 330622743756818, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12857147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428673 + 6428674.

It is an arithmetic number, because the mean of its divisors is an integer number (6428674).

Almost surely, 2^12857347 is an apocalyptic number.

12857347 is a deficient number, since it is larger than the sum of its proper divisors (1).

12857347 is an equidigital number, since it uses as much as digits as its factorization.

12857347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 12857347 is about 3585.7142942516. The cubic root of 12857347 is about 234.2702395695.

It can be divided in two parts, 128 and 57347, that added together give a palindrome (57475).

The spelling of 12857347 in words is "twelve million, eight hundred fifty-seven thousand, three hundred forty-seven".