6444643 has 4 divisors (see below), whose sum is σ = 6449968. Its totient is φ = 6439320.

The previous prime is 6444637. The next prime is 6444653. The reversal of 6444643 is 3464446.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6444643 - 2⁵ = 6444611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6444653) 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 in 3 ways as a sum of consecutive naturals, for example, 130 + ... + 3592.

It is an arithmetic number, because the mean of its divisors is an integer number (1612492).

Almost surely, 2^6444643 is an apocalyptic number.

6444643 is a deficient number, since it is larger than the sum of its proper divisors (5325).

6444643 is a wasteful number, since it uses less digits than its factorization.

6444643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324.

The product of its digits is 27648, while the sum is 31.

The square root of 6444643 is about 2538.6301424193. The cubic root of 6444643 is about 186.0942502254.

The spelling of 6444643 in words is "six million, four hundred forty-four thousand, six hundred forty-three".