6440447 has 8 divisors (see below), whose sum is σ = 6956880. Its totient is φ = 5927040.

The previous prime is 6440443. The next prime is 6440453. The reversal of 6440447 is 7440446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6440447 - 2² = 6440443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5879 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (869610).

Almost surely, 2^6440447 is an apocalyptic number.

6440447 is a deficient number, since it is larger than the sum of its proper divisors (516433).

6440447 is a wasteful number, since it uses less digits than its factorization.

6440447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513.

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 6440447 is about 2537.8035778996. The cubic root of 6440447 is about 186.0538538320.

Subtracting 6440447 from its reverse (7440446), we obtain a palindrome (999999).

The spelling of 6440447 in words is "six million, four hundred forty thousand, four hundred forty-seven".