6644143 has 4 divisors (see below), whose sum is σ = 7248168. Its totient is φ = 6040120.

The previous prime is 6644123. The next prime is 6644147. The reversal of 6644143 is 3414466.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6644143 - 2⁵ = 6644111 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 (6644147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301996 + ... + 302017.

It is an arithmetic number, because the mean of its divisors is an integer number (1812042).

Almost surely, 2^6644143 is an apocalyptic number.

6644143 is a deficient number, since it is larger than the sum of its proper divisors (604025).

6644143 is a wasteful number, since it uses less digits than its factorization.

6644143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604024.

The product of its digits is 6912, while the sum is 28.

The square root of 6644143 is about 2577.6235178940. The cubic root of 6644143 is about 187.9950108077.

The spelling of 6644143 in words is "six million, six hundred forty-four thousand, one hundred forty-three".