1317986 has 8 divisors (see below), whose sum is σ = 2025324. Its totient is φ = 642880.

The previous prime is 1317971. The next prime is 1317989. The reversal of 1317986 is 6897131.

It can be written as a sum of positive squares in 2 ways, for example, as 1062961 + 255025 = 1031^2 + 505^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1317989) 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, 7955 + ... + 8118.

2^1317986 is an apocalyptic number.

1317986 is a deficient number, since it is larger than the sum of its proper divisors (707338).

1317986 is a wasteful number, since it uses less digits than its factorization.

1317986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16116.

The product of its digits is 9072, while the sum is 35.

The square root of 1317986 is about 1148.0357137302. The cubic root of 1317986 is about 109.6403127496.

The spelling of 1317986 in words is "one million, three hundred seventeen thousand, nine hundred eighty-six".