6638339 has 2 divisors, whose sum is σ = 6638340. Its totient is φ = 6638338.

The previous prime is 6638321. The next prime is 6638341. The reversal of 6638339 is 9338366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6638339 - 2²⁰ = 5589763 is a prime.

Together with 6638341, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6638369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319169 + 3319170.

It is an arithmetic number, because the mean of its divisors is an integer number (3319170).

Almost surely, 2^6638339 is an apocalyptic number.

6638339 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638339 is an equidigital number, since it uses as much as digits as its factorization.

6638339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 38.

The square root of 6638339 is about 2576.4974286810. The cubic root of 6638339 is about 187.9402537626.

The spelling of 6638339 in words is "six million, six hundred thirty-eight thousand, three hundred thirty-nine".