12381722540 has 96 divisors (see below), whose sum is σ = 30396570624. Its totient is φ = 4186434560.

The previous prime is 12381722539. The next prime is 12381722611. The reversal of 12381722540 is 4522718321.

It is a self number, because there is not a number n which added to its sum of digits gives 12381722540.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 290477 + ... + 330363.

It is an arithmetic number, because the mean of its divisors is an integer number (316630944).

Almost surely, 2^12381722540 is an apocalyptic number.

12381722540 is a gapful number since it is divisible by the number (10) 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 12381722540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15198285312).

12381722540 is an abundant number, since it is smaller than the sum of its proper divisors (18014848084).

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

12381722540 is a wasteful number, since it uses less digits than its factorization.

12381722540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40007 (or 40005 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 12381722540 in words is "twelve billion, three hundred eighty-one million, seven hundred twenty-two thousand, five hundred forty".