11836813 has 4 divisors (see below), whose sum is σ = 11958940. Its totient is φ = 11714688.

The previous prime is 11836801. The next prime is 11836817. The reversal of 11836813 is 31863811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31863811 = 7 ⋅4551973.

It can be written as a sum of positive squares in 2 ways, for example, as 3087049 + 8749764 = 1757^2 + 2958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11836813 is a prime.

It is a super-2 number, since 2×11836813² = 280220283993938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11836817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60918 + ... + 61111.

It is an arithmetic number, because the mean of its divisors is an integer number (2989735).

Almost surely, 2^11836813 is an apocalyptic number.

It is an amenable number.

11836813 is a deficient number, since it is larger than the sum of its proper divisors (122127).

11836813 is an equidigital number, since it uses as much as digits as its factorization.

11836813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122126.

The product of its digits is 3456, while the sum is 31.

The square root of 11836813 is about 3440.4669741185. The cubic root of 11836813 is about 227.9003167914.

The spelling of 11836813 in words is "eleven million, eight hundred thirty-six thousand, eight hundred thirteen".