1312986856 has 16 divisors (see below), whose sum is σ = 2468456100. Its totient is φ = 654731904.

The previous prime is 1312986853. The next prime is 1312986869. The reversal of 1312986856 is 6586892131.

It can be written as a sum of positive squares in 2 ways, for example, as 1312902756 + 84100 = 36234^2 + 290^2 .

It is not an unprimeable number, because it can be changed into a prime (1312986853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217021 + ... + 222988.

Almost surely, 2^1312986856 is an apocalyptic number.

It is an amenable number.

1312986856 is a deficient number, since it is larger than the sum of its proper divisors (1155469244).

1312986856 is a wasteful number, since it uses less digits than its factorization.

1312986856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440388 (or 440384 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 1312986856 is about 36235.1604936421. The cubic root of 1312986856 is about 1095.0151457077.

The spelling of 1312986856 in words is "one billion, three hundred twelve million, nine hundred eighty-six thousand, eight hundred fifty-six".