6440944 has 10 divisors (see below), whose sum is σ = 12479360. Its totient is φ = 3220464.

The previous prime is 6440939. The next prime is 6440947. The reversal of 6440944 is 4490446.

It is a super-2 number, since 2×6440944² = 82971519222272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201264 + ... + 201295.

It is an arithmetic number, because the mean of its divisors is an integer number (1247936).

Almost surely, 2^6440944 is an apocalyptic number.

It is an amenable number.

6440944 is a deficient number, since it is larger than the sum of its proper divisors (6038416).

6440944 is a wasteful number, since it uses less digits than its factorization.

6440944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402567 (or 402561 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 6440944 is about 2537.9014953303. The cubic root of 6440944 is about 186.0586395447.

The spelling of 6440944 in words is "six million, four hundred forty thousand, nine hundred forty-four".