12391836 has 24 divisors (see below), whose sum is σ = 28976640. Its totient is φ = 4121712.

The previous prime is 12391831. The next prime is 12391867. The reversal of 12391836 is 63819321.

It is a junction number, because it is equal to n+sod(n) for n = 12391797 and 12391806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12391831) 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 7 ways as a sum of consecutive naturals, for example, 7125 + ... + 8691.

It is an arithmetic number, because the mean of its divisors is an integer number (1207360).

Almost surely, 2^12391836 is an apocalyptic number.

It is an amenable number.

12391836 is an abundant number, since it is smaller than the sum of its proper divisors (16584804).

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

12391836 is a wasteful number, since it uses less digits than its factorization.

12391836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233 (or 2231 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 12391836 is about 3520.2039713630. The cubic root of 12391836 is about 231.4080977817.

The spelling of 12391836 in words is "twelve million, three hundred ninety-one thousand, eight hundred thirty-six".