6440244 has 12 divisors (see below), whose sum is σ = 15027264. Its totient is φ = 2146744.

The previous prime is 6440201. The next prime is 6440249. The reversal of 6440244 is 4420446.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268332 + ... + 268355.

It is an arithmetic number, because the mean of its divisors is an integer number (1252272).

Almost surely, 2^6440244 is an apocalyptic number.

It is an amenable number.

6440244 is an abundant number, since it is smaller than the sum of its proper divisors (8587020).

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

6440244 is a wasteful number, since it uses less digits than its factorization.

6440244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536694 (or 536692 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 6440244 is about 2537.7635823693. The cubic root of 6440244 is about 186.0518990334.

It can be divided in two parts, 64402 and 44, that added together give a palindrome (64446).

The spelling of 6440244 in words is "six million, four hundred forty thousand, two hundred forty-four".