12181444 has 24 divisors (see below), whose sum is σ = 24268608. Its totient is φ = 5295840.

The previous prime is 12181423. The next prime is 12181447. The reversal of 12181444 is 44418121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5007 + ... + 7030.

It is an arithmetic number, because the mean of its divisors is an integer number (1011192).

Almost surely, 2^12181444 is an apocalyptic number.

It is an amenable number.

12181444 is a deficient number, since it is larger than the sum of its proper divisors (12087164).

12181444 is a wasteful number, since it uses less digits than its factorization.

12181444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12075 (or 12073 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 12181444 is about 3490.1925448319. The cubic root of 12181444 is about 230.0909785007.

Adding to 12181444 its reverse (44418121), we get a palindrome (56599565).

It can be divided in two parts, 1218 and 1444, that added together give a palindrome (2662).

The spelling of 12181444 in words is "twelve million, one hundred eighty-one thousand, four hundred forty-four".