12857971 has 4 divisors (see below), whose sum is σ = 14694832. Its totient is φ = 11021112.

The previous prime is 12857953. The next prime is 12857983. The reversal of 12857971 is 17975821.

12857971 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17975821 = 37 ⋅485833.

It is a cyclic number.

It is not a de Polignac number, because 12857971 - 2⁷ = 12857843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12857941) 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 in 3 ways as a sum of consecutive naturals, for example, 918420 + ... + 918433.

It is an arithmetic number, because the mean of its divisors is an integer number (3673708).

Almost surely, 2^12857971 is an apocalyptic number.

12857971 is a deficient number, since it is larger than the sum of its proper divisors (1836861).

12857971 is an equidigital number, since it uses as much as digits as its factorization.

12857971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836860.

The product of its digits is 35280, while the sum is 40.

The square root of 12857971 is about 3585.8013051478. The cubic root of 12857971 is about 234.2740294199.

The spelling of 12857971 in words is "twelve million, eight hundred fifty-seven thousand, nine hundred seventy-one".