1311866 has 8 divisors (see below), whose sum is σ = 2000244. Its totient is φ = 645120.

The previous prime is 1311857. The next prime is 1311899. The reversal of 1311866 is 6681131.

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 841 = 1145^2 + 29^2 .

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

It is a nialpdrome in base 12.

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, 5255 + ... + 5498.

2^1311866 is an apocalyptic number.

1311866 is a deficient number, since it is larger than the sum of its proper divisors (688378).

1311866 is a wasteful number, since it uses less digits than its factorization.

1311866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10816.

The product of its digits is 864, while the sum is 26.

The square root of 1311866 is about 1145.3671900312. The cubic root of 1311866 is about 109.4703463554.

Adding to 1311866 its reverse (6681131), we get a palindrome (7992997).

The spelling of 1311866 in words is "one million, three hundred eleven thousand, eight hundred sixty-six".