12138723418 has 16 divisors (see below), whose sum is σ = 19289330280. Its totient is φ = 5709323776.

The previous prime is 12138723397. The next prime is 12138723431. The reversal of 12138723418 is 81432783121.

It can be written as a sum of positive squares in 4 ways, for example, as 11723908729 + 414814689 = 108277^2 + 20367^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28273 + ... + 158356.

Almost surely, 2^12138723418 is an apocalyptic number.

12138723418 is a deficient number, since it is larger than the sum of its proper divisors (7150606862).

12138723418 is a wasteful number, since it uses less digits than its factorization.

12138723418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188561.

The product of its digits is 64512, while the sum is 40.

The spelling of 12138723418 in words is "twelve billion, one hundred thirty-eight million, seven hundred twenty-three thousand, four hundred eighteen".