6647983 has 2 divisors, whose sum is σ = 6647984. Its totient is φ = 6647982.

The previous prime is 6647959. The next prime is 6647987. The reversal of 6647983 is 3897466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6647983 - 2⁵ = 6647951 is a prime.

It is a d-powerful number, because it can be written as 6 + 6⁷ + 4¹¹ + 7⁵ + 9³ + 8⁷ + 3¹⁰ .

6647983 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647987) 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 as a sum of consecutive naturals, namely, 3323991 + 3323992.

It is an arithmetic number, because the mean of its divisors is an integer number (3323992).

Almost surely, 2^6647983 is an apocalyptic number.

6647983 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647983 is an equidigital number, since it uses as much as digits as its factorization.

6647983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 6647983 is about 2578.3682824608. The cubic root of 6647983 is about 188.0312212370.

The spelling of 6647983 in words is "six million, six hundred forty-seven thousand, nine hundred eighty-three".