12391924644 has 120 divisors (see below), whose sum is σ = 35684096448. Its totient is φ = 3718560960.

The previous prime is 12391924627. The next prime is 12391924667. The reversal of 12391924644 is 44642919321.

12391924644 is a `hidden beast` number, since 12 + 3 + 91 + 92 + 464 + 4 = 666.

12391924644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 12391924644.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 350214 + ... + 383970.

Almost surely, 2^12391924644 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 12391924644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17842048224).

12391924644 is an abundant number, since it is smaller than the sum of its proper divisors (23292171804).

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

12391924644 is a wasteful number, since it uses less digits than its factorization.

12391924644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33887 (or 33876 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The spelling of 12391924644 in words is "twelve billion, three hundred ninety-one million, nine hundred twenty-four thousand, six hundred forty-four".