18871212386 has 8 divisors (see below), whose sum is σ = 30484266204. Its totient is φ = 8709790320.

The previous prime is 18871212361. The next prime is 18871212391. The reversal of 18871212386 is 68321217881.

It can be written as a sum of positive squares in 2 ways, for example, as 18870242161 + 970225 = 137369^2 + 985^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18871212386² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18871212386.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362907905 + ... + 362907956.

Almost surely, 2^18871212386 is an apocalyptic number.

18871212386 is a deficient number, since it is larger than the sum of its proper divisors (11613053818).

18871212386 is a wasteful number, since it uses less digits than its factorization.

18871212386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725815876.

The product of its digits is 258048, while the sum is 47.

The spelling of 18871212386 in words is "eighteen billion, eight hundred seventy-one million, two hundred twelve thousand, three hundred eighty-six".