12117144 has 64 divisors (see below), whose sum is σ = 33143040. Its totient is φ = 3669120.

The previous prime is 12117121. The next prime is 12117221. The reversal of 12117144 is 44171121.

It is a self number, because there is not a number n which added to its sum of digits gives 12117144.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21879 + ... + 22425.

It is an arithmetic number, because the mean of its divisors is an integer number (517860).

Almost surely, 2^12117144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12117144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16571520).

12117144 is an abundant number, since it is smaller than the sum of its proper divisors (21025896).

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

12117144 is a wasteful number, since it uses less digits than its factorization.

12117144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 636 counting only the distinct ones).

The product of its digits is 224, while the sum is 21.

The square root of 12117144 is about 3480.9688306562. The cubic root of 12117144 is about 229.6854174368.

Adding to 12117144 its reverse (44171121), we get a palindrome (56288265).

The spelling of 12117144 in words is "twelve million, one hundred seventeen thousand, one hundred forty-four".