12391445440 has 84 divisors (see below), whose sum is σ = 32433557688. Its totient is φ = 4505966080.

The previous prime is 12391445419. The next prime is 12391445453. The reversal of 12391445440 is 4454419321.

It is a self number, because there is not a number n which added to its sum of digits gives 12391445440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121294 + ... + 198733.

It is an arithmetic number, because the mean of its divisors is an integer number (386113782).

Almost surely, 2^12391445440 is an apocalyptic number.

12391445440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12391445440 is an abundant number, since it is smaller than the sum of its proper divisors (20042112248).

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

12391445440 is a wasteful number, since it uses less digits than its factorization.

12391445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320066 (or 320045 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 12391445440 in words is "twelve billion, three hundred ninety-one million, four hundred forty-five thousand, four hundred forty".