6400244 has 6 divisors (see below), whose sum is σ = 11200434. Its totient is φ = 3200120.

The previous prime is 6400241. The next prime is 6400253. The reversal of 6400244 is 4420046.

It can be written as a sum of positive squares in only one way, i.e., 4787344 + 1612900 = 2188^2 + 1270^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400241) 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, 800027 + ... + 800034.

It is an arithmetic number, because the mean of its divisors is an integer number (1866739).

Almost surely, 2^6400244 is an apocalyptic number.

It is an amenable number.

6400244 is a deficient number, since it is larger than the sum of its proper divisors (4800190).

6400244 is a wasteful number, since it uses less digits than its factorization.

6400244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600065 (or 1600063 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 6400244 is about 2529.8703524094. The cubic root of 6400244 is about 185.6659127889.

It can be divided in two parts, 64002 and 44, that added together give a palindrome (64046).

The spelling of 6400244 in words is "six million, four hundred thousand, two hundred forty-four".