12489381819 has 18 divisors (see below), whose sum is σ = 18733130780. Its totient is φ = 8326250172.

The previous prime is 12489381809. The next prime is 12489381833. The reversal of 12489381819 is 91818398421.

It is a happy number.

12489381819 is a `hidden beast` number, since 1 + 2 + 489 + 3 + 81 + 81 + 9 = 666.

It is not a de Polignac number, because 12489381819 - 2⁵ = 12489381787 is a prime.

It is a super-2 number, since 2×12489381819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12489381809) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 945229 + ... + 958350.

Almost surely, 2^12489381819 is an apocalyptic number.

12489381819 is a deficient number, since it is larger than the sum of its proper divisors (6243748961).

12489381819 is an frugal number, since it uses more digits than its factorization.

12489381819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903603 (or 1903582 counting only the distinct ones).

The product of its digits is 995328, while the sum is 54.

The spelling of 12489381819 in words is "twelve billion, four hundred eighty-nine million, three hundred eighty-one thousand, eight hundred nineteen".