12857785 has 4 divisors (see below), whose sum is σ = 15429348. Its totient is φ = 10286224.

The previous prime is 12857771. The next prime is 12857791. The reversal of 12857785 is 58775821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58775821 = 13 ⋅4521217.

It can be written as a sum of positive squares in 2 ways, for example, as 6370576 + 6487209 = 2524^2 + 2547^2 .

It is a cyclic number.

It is not a de Polignac number, because 12857785 - 2¹⁵ = 12825017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1285774 + ... + 1285783.

It is an arithmetic number, because the mean of its divisors is an integer number (3857337).

Almost surely, 2^12857785 is an apocalyptic number.

It is an amenable number.

12857785 is a deficient number, since it is larger than the sum of its proper divisors (2571563).

12857785 is an equidigital number, since it uses as much as digits as its factorization.

12857785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571562.

The product of its digits is 156800, while the sum is 43.

The square root of 12857785 is about 3585.7753694285. The cubic root of 12857785 is about 234.2728997658.

The spelling of 12857785 in words is "twelve million, eight hundred fifty-seven thousand, seven hundred eighty-five".