6440522 has 16 divisors (see below), whose sum is σ = 10608192. Its totient is φ = 2908320.

The previous prime is 6440519. The next prime is 6440537. The reversal of 6440522 is 2250446.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2798 + ... + 4550.

It is an arithmetic number, because the mean of its divisors is an integer number (663012).

Almost surely, 2^6440522 is an apocalyptic number.

6440522 is a deficient number, since it is larger than the sum of its proper divisors (4167670).

6440522 is a wasteful number, since it uses less digits than its factorization.

6440522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 6440522 is about 2537.8183544139. The cubic root of 6440522 is about 186.0545760378.

Adding to 6440522 its reverse (2250446), we get a palindrome (8690968).

The spelling of 6440522 in words is "six million, four hundred forty thousand, five hundred twenty-two".