1311816 has 32 divisors (see below), whose sum is σ = 3578400. Its totient is φ = 397440.

The previous prime is 1311799. The next prime is 1311829. The reversal of 1311816 is 6181131.

It is a super-2 number, since 2×1311816² = 3441722435712, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1311792 and 1311801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2221 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (111825).

2^1311816 is an apocalyptic number.

It is an amenable number.

1311816 is an abundant number, since it is smaller than the sum of its proper divisors (2266584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311816 is a wasteful number, since it uses less digits than its factorization.

1311816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989 (or 4985 counting only the distinct ones).

The product of its digits is 144, while the sum is 21.

The square root of 1311816 is about 1145.3453627618. The cubic root of 1311816 is about 109.4689555663.

Adding to 1311816 its reverse (6181131), we get a palindrome (7492947).

The spelling of 1311816 in words is "one million, three hundred eleven thousand, eight hundred sixteen".