6649823 has 2 divisors, whose sum is σ = 6649824. Its totient is φ = 6649822.

The previous prime is 6649801. The next prime is 6649837. The reversal of 6649823 is 3289466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6649823 - 2²⁰ = 5601247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6649883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324911 + 3324912.

It is an arithmetic number, because the mean of its divisors is an integer number (3324912).

Almost surely, 2^6649823 is an apocalyptic number.

6649823 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649823 is an equidigital number, since it uses as much as digits as its factorization.

6649823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 6649823 is about 2578.7250725892. The cubic root of 6649823 is about 188.0485671264.

The spelling of 6649823 in words is "six million, six hundred forty-nine thousand, eight hundred twenty-three".