1312857 has 36 divisors (see below), whose sum is σ = 2386020. Its totient is φ = 689472.

The previous prime is 1312853. The next prime is 1312867. The reversal of 1312857 is 7582131.

It can be written as a sum of positive squares in 2 ways, for example, as 741321 + 571536 = 861^2 + 756^2 .

It is not a de Polignac number, because 1312857 - 2² = 1312853 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1312857.

It is not an unprimeable number, because it can be changed into a prime (1312853) 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 in 35 ways as a sum of consecutive naturals, for example, 5619 + ... + 5847.

2^1312857 is an apocalyptic number.

It is an amenable number.

1312857 is a deficient number, since it is larger than the sum of its proper divisors (1073163).

1312857 is a wasteful number, since it uses less digits than its factorization.

1312857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 252 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1312857 is about 1145.7997207191. The cubic root of 1312857 is about 109.4979045073.

Adding to 1312857 its reverse (7582131), we get a palindrome (8894988).

The spelling of 1312857 in words is "one million, three hundred twelve thousand, eight hundred fifty-seven".