12381722538 has 16 divisors (see below), whose sum is σ = 25169403936. Its totient is φ = 4059581040.

The previous prime is 12381722497. The next prime is 12381722539. The reversal of 12381722538 is 83522718321.

It is a super-2 number, since 2×12381722538² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12381722538.

It is not an unprimeable number, because it can be changed into a prime (12381722539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16914556 + ... + 16915287.

It is an arithmetic number, because the mean of its divisors is an integer number (1573087746).

Almost surely, 2^12381722538 is an apocalyptic number.

12381722538 is an abundant number, since it is smaller than the sum of its proper divisors (12787681398).

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

12381722538 is a wasteful number, since it uses less digits than its factorization.

12381722538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33829909.

The product of its digits is 161280, while the sum is 42.

The spelling of 12381722538 in words is "twelve billion, three hundred eighty-one million, seven hundred twenty-two thousand, five hundred thirty-eight".