11811839 has 4 divisors (see below), whose sum is σ = 12720456. Its totient is φ = 10903224.

The previous prime is 11811797. The next prime is 11811847. The reversal of 11811839 is 93811811.

11811839 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11811839 - 2¹² = 11807743 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 (11811869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454289 + ... + 454314.

It is an arithmetic number, because the mean of its divisors is an integer number (3180114).

Almost surely, 2^11811839 is an apocalyptic number.

11811839 is a deficient number, since it is larger than the sum of its proper divisors (908617).

11811839 is an equidigital number, since it uses as much as digits as its factorization.

11811839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908616.

The product of its digits is 1728, while the sum is 32.

The square root of 11811839 is about 3436.8356085213. The cubic root of 11811839 is about 227.7399248002.

The spelling of 11811839 in words is "eleven million, eight hundred eleven thousand, eight hundred thirty-nine".