12391912 has 64 divisors (see below), whose sum is σ = 27276480. Its totient is φ = 5225472.

The previous prime is 12391867. The next prime is 12391913. The reversal of 12391912 is 21919321.

It is not an unprimeable number, because it can be changed into a prime (12391913) 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 15 ways as a sum of consecutive naturals, for example, 75943 + ... + 76105.

It is an arithmetic number, because the mean of its divisors is an integer number (426195).

Almost surely, 2^12391912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12391912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13638240).

12391912 is an abundant number, since it is smaller than the sum of its proper divisors (14884568).

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

12391912 is a wasteful number, since it uses less digits than its factorization.

12391912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 238 counting only the distinct ones).

The product of its digits is 972, while the sum is 28.

The square root of 12391912 is about 3520.2147661755. The cubic root of 12391912 is about 231.4085708614.

The spelling of 12391912 in words is "twelve million, three hundred ninety-one thousand, nine hundred twelve".