12797857 has 4 divisors (see below), whose sum is σ = 13039380. Its totient is φ = 12556336.

The previous prime is 12797833. The next prime is 12797879. The reversal of 12797857 is 75879721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75879721 = 17 ⋅4463513.

It can be written as a sum of positive squares in 2 ways, for example, as 11262736 + 1535121 = 3356^2 + 1239^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12797857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12797357) 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, 120682 + ... + 120787.

It is an arithmetic number, because the mean of its divisors is an integer number (3259845).

Almost surely, 2^12797857 is an apocalyptic number.

It is an amenable number.

12797857 is a deficient number, since it is larger than the sum of its proper divisors (241523).

12797857 is an equidigital number, since it uses as much as digits as its factorization.

12797857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241522.

The product of its digits is 246960, while the sum is 46.

The square root of 12797857 is about 3577.4092581084. The cubic root of 12797857 is about 233.9083638076.

The spelling of 12797857 in words is "twelve million, seven hundred ninety-seven thousand, eight hundred fifty-seven".