12144638 has 8 divisors (see below), whose sum is σ = 19873080. Its totient is φ = 5520280.

The previous prime is 12144637. The next prime is 12144677. The reversal of 12144638 is 83644121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12144638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12144631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275993 + ... + 276036.

It is an arithmetic number, because the mean of its divisors is an integer number (2484135).

Almost surely, 2^12144638 is an apocalyptic number.

12144638 is a deficient number, since it is larger than the sum of its proper divisors (7728442).

12144638 is a wasteful number, since it uses less digits than its factorization.

12144638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552042.

The product of its digits is 4608, while the sum is 29.

The square root of 12144638 is about 3484.9157809049. The cubic root of 12144638 is about 229.8590062137.

Adding to 12144638 its reverse (83644121), we get a palindrome (95788759).

The spelling of 12144638 in words is "twelve million, one hundred forty-four thousand, six hundred thirty-eight".