12731144 has 16 divisors (see below), whose sum is σ = 24909120. Its totient is φ = 6088720.

The previous prime is 12731129. The next prime is 12731161. The reversal of 12731144 is 44113721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34412 + ... + 34779.

It is an arithmetic number, because the mean of its divisors is an integer number (1556820).

Almost surely, 2^12731144 is an apocalyptic number.

It is an amenable number.

12731144 is a deficient number, since it is larger than the sum of its proper divisors (12177976).

12731144 is a wasteful number, since it uses less digits than its factorization.

12731144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69220 (or 69216 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 12731144 is about 3568.0728692111. The cubic root of 12731144 is about 233.5012143297.

Adding to 12731144 its reverse (44113721), we get a palindrome (56844865).

The spelling of 12731144 in words is "twelve million, seven hundred thirty-one thousand, one hundred forty-four".