11788421 has 4 divisors (see below), whose sum is σ = 11816844. Its totient is φ = 11760000.

The previous prime is 11788391. The next prime is 11788423. The reversal of 11788421 is 12488711.

11788421 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 can be written as a sum of positive squares in 2 ways, for example, as 2937796 + 8850625 = 1714^2 + 2975^2 .

It is a cyclic number.

It is not a de Polignac number, because 11788421 - 2¹⁴ = 11772037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11788423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13580 + ... + 14421.

It is an arithmetic number, because the mean of its divisors is an integer number (2954211).

Almost surely, 2^11788421 is an apocalyptic number.

It is an amenable number.

11788421 is a deficient number, since it is larger than the sum of its proper divisors (28423).

11788421 is an equidigital number, since it uses as much as digits as its factorization.

11788421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28422.

The product of its digits is 3584, while the sum is 32.

The square root of 11788421 is about 3433.4270051947. The cubic root of 11788421 is about 227.5893204795.

The spelling of 11788421 in words is "eleven million, seven hundred eighty-eight thousand, four hundred twenty-one".