12394889181 has 12 divisors (see below), whose sum is σ = 17904867708. Its totient is φ = 8262733824.

The previous prime is 12394889141. The next prime is 12394889203. The reversal of 12394889181 is 18198849321.

It is a happy number.

12394889181 is a `hidden beast` number, since 12 + 394 + 88 + 91 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10321544025 + 2073345156 = 101595^2 + 45534^2 .

It is not a de Polignac number, because 12394889181 - 2¹⁰ = 12394888157 is a prime.

It is a super-2 number, since 2×12394889181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12394889141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151261 + ... + 218333.

It is an arithmetic number, because the mean of its divisors is an integer number (1492072309).

Almost surely, 2^12394889181 is an apocalyptic number.

It is an amenable number.

12394889181 is a deficient number, since it is larger than the sum of its proper divisors (5509978527).

12394889181 is a wasteful number, since it uses less digits than its factorization.

12394889181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87612 (or 87609 counting only the distinct ones).

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

The spelling of 12394889181 in words is "twelve billion, three hundred ninety-four million, eight hundred eighty-nine thousand, one hundred eighty-one".