13440244 has 6 divisors (see below), whose sum is σ = 23520434. Its totient is φ = 6720120.

The previous prime is 13440241. The next prime is 13440269. The reversal of 13440244 is 44204431.

13440244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9072144 + 4368100 = 3012^2 + 2090^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1680027 + ... + 1680034.

Almost surely, 2^13440244 is an apocalyptic number.

It is an amenable number.

13440244 is a deficient number, since it is larger than the sum of its proper divisors (10080190).

13440244 is a wasteful number, since it uses less digits than its factorization.

13440244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3360065 (or 3360063 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 13440244 is about 3666.0938340419. The cubic root of 13440244 is about 237.7583169083.

Adding to 13440244 its reverse (44204431), we get a palindrome (57644675).

The spelling of 13440244 in words is "thirteen million, four hundred forty thousand, two hundred forty-four".