12189678844 has 72 divisors (see below), whose sum is σ = 26516231280. Its totient is φ = 4871591424.

The previous prime is 12189678833. The next prime is 12189678847. The reversal of 12189678844 is 44887698121.

It is a super-2 number, since 2×12189678844² (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 (12189678847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346407 + ... + 379969.

It is an arithmetic number, because the mean of its divisors is an integer number (368280990).

Almost surely, 2^12189678844 is an apocalyptic number.

12189678844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12189678844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13258115640).

12189678844 is an abundant number, since it is smaller than the sum of its proper divisors (14326552436).

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

12189678844 is a wasteful number, since it uses less digits than its factorization.

12189678844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33707 (or 33698 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 58.

The spelling of 12189678844 in words is "twelve billion, one hundred eighty-nine million, six hundred seventy-eight thousand, eight hundred forty-four".