6642843 has 4 divisors (see below), whose sum is σ = 8857128. Its totient is φ = 4428560.

The previous prime is 6642829. The next prime is 6642847. The reversal of 6642843 is 3482466.

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 6642843 - 2²¹ = 4545691 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6642847) 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, 1107138 + ... + 1107143.

It is an arithmetic number, because the mean of its divisors is an integer number (2214282).

Almost surely, 2^6642843 is an apocalyptic number.

6642843 is a deficient number, since it is larger than the sum of its proper divisors (2214285).

6642843 is a wasteful number, since it uses less digits than its factorization.

6642843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214284.

The product of its digits is 27648, while the sum is 33.

The square root of 6642843 is about 2577.3713352949. The cubic root of 6642843 is about 187.9827489075.

The spelling of 6642843 in words is "six million, six hundred forty-two thousand, eight hundred forty-three".