6440422 has 4 divisors (see below), whose sum is σ = 9660636. Its totient is φ = 3220210.

The previous prime is 6440419. The next prime is 6440429. The reversal of 6440422 is 2240446.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 6440393 and 6440402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440429) 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, 1610104 + ... + 1610107.

It is an arithmetic number, because the mean of its divisors is an integer number (2415159).

Almost surely, 2^6440422 is an apocalyptic number.

6440422 is a deficient number, since it is larger than the sum of its proper divisors (3220214).

6440422 is a wasteful number, since it uses less digits than its factorization.

6440422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220213.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 6440422 is about 2537.7986523757. The cubic root of 6440422 is about 186.0536130955.

Adding to 6440422 its reverse (2240446), we get a palindrome (8680868).

The spelling of 6440422 in words is "six million, four hundred forty thousand, four hundred twenty-two".