12381938440 has 64 divisors (see below), whose sum is σ = 30054803760. Its totient is φ = 4573470720.

The previous prime is 12381938431. The next prime is 12381938441. The reversal of 12381938440 is 4483918321.

It can be written as a sum of positive squares in 8 ways, for example, as 9833102244 + 2548836196 = 99162^2 + 50486^2 .

It is not an unprimeable number, because it can be changed into a prime (12381938441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135741 + ... + 207820.

Almost surely, 2^12381938440 is an apocalyptic number.

12381938440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12381938440 is an abundant number, since it is smaller than the sum of its proper divisors (17672865320).

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

12381938440 is a wasteful number, since it uses less digits than its factorization.

12381938440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343642 (or 343638 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 12381938440 in words is "twelve billion, three hundred eighty-one million, nine hundred thirty-eight thousand, four hundred forty".