12391872 has 56 divisors (see below), whose sum is σ = 33046416. Its totient is φ = 4098048.

The previous prime is 12391867. The next prime is 12391913. The reversal of 12391872 is 27819321.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 44598 + ... + 44874.

Almost surely, 2^12391872 is an apocalyptic number.

12391872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12391872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16523208).

12391872 is an abundant number, since it is smaller than the sum of its proper divisors (20654544).

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

12391872 is a wasteful number, since it uses less digits than its factorization.

12391872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 515 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 12391872 is about 3520.2090846994. The cubic root of 12391872 is about 231.4083218723.

The spelling of 12391872 in words is "twelve million, three hundred ninety-one thousand, eight hundred seventy-two".