11808813 has 4 divisors (see below), whose sum is σ = 15745088. Its totient is φ = 7872540.

The previous prime is 11808793. The next prime is 11808833. The reversal of 11808813 is 31880811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11808793) and next prime (11808833).

It is not a de Polignac number, because 11808813 - 2⁵ = 11808781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11808833) 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, 1968133 + ... + 1968138.

It is an arithmetic number, because the mean of its divisors is an integer number (3936272).

Almost surely, 2^11808813 is an apocalyptic number.

It is an amenable number.

11808813 is a deficient number, since it is larger than the sum of its proper divisors (3936275).

11808813 is an equidigital number, since it uses as much as digits as its factorization.

11808813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936274.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 11808813 is about 3436.3953497815. The cubic root of 11808813 is about 227.7204753910.

It can be divided in two parts, 11808 and 813, that added together give a palindrome (12621).

The spelling of 11808813 in words is "eleven million, eight hundred eight thousand, eight hundred thirteen".