12181044 has 72 divisors (see below), whose sum is σ = 31606848. Its totient is φ = 3637760.

The previous prime is 12181031. The next prime is 12181051. The reversal of 12181044 is 44018121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12181044.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171529 + ... + 171599.

It is an arithmetic number, because the mean of its divisors is an integer number (438984).

Almost surely, 2^12181044 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 12181044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15803424).

12181044 is an abundant number, since it is smaller than the sum of its proper divisors (19425804).

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

12181044 is a wasteful number, since it uses less digits than its factorization.

12181044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 12181044 is about 3490.1352409326. The cubic root of 12181044 is about 230.0884599870.

Adding to 12181044 its reverse (44018121), we get a palindrome (56199165).

The spelling of 12181044 in words is "twelve million, one hundred eighty-one thousand, forty-four".