1311986 has 8 divisors (see below), whose sum is σ = 2119404. Its totient is φ = 605520.

The previous prime is 1311971. The next prime is 1311991. The reversal of 1311986 is 6891131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 961 = 1145^2 + 31^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25205 + ... + 25256.

2^1311986 is an apocalyptic number.

1311986 is a deficient number, since it is larger than the sum of its proper divisors (807418).

1311986 is a wasteful number, since it uses less digits than its factorization.

1311986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50476.

The product of its digits is 1296, while the sum is 29.

The square root of 1311986 is about 1145.4195737807. The cubic root of 1311986 is about 109.4736841051.

The spelling of 1311986 in words is "one million, three hundred eleven thousand, nine hundred eighty-six".