6440322 has 64 divisors (see below), whose sum is σ = 15759360. Its totient is φ = 1714944.

The previous prime is 6440311. The next prime is 6440327. The reversal of 6440322 is 2230446.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (6440327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56938 + ... + 57050.

It is an arithmetic number, because the mean of its divisors is an integer number (246240).

Almost surely, 2^6440322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7879680).

6440322 is an abundant number, since it is smaller than the sum of its proper divisors (9319038).

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

6440322 is a wasteful number, since it uses less digits than its factorization.

6440322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 6440322 is about 2537.7789501846. The cubic root of 6440322 is about 186.0526501431.

Adding to 6440322 its reverse (2230446), we get a palindrome (8670768).

The spelling of 6440322 in words is "six million, four hundred forty thousand, three hundred twenty-two".