6638459 has 2 divisors, whose sum is σ = 6638460. Its totient is φ = 6638458.

The previous prime is 6638407. The next prime is 6638473. The reversal of 6638459 is 9548366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6638459 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6632459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319229 + 3319230.

It is an arithmetic number, because the mean of its divisors is an integer number (3319230).

Almost surely, 2^6638459 is an apocalyptic number.

6638459 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638459 is an equidigital number, since it uses as much as digits as its factorization.

6638459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 41.

The square root of 6638459 is about 2576.5207160044. The cubic root of 6638459 is about 187.9413862092.

The spelling of 6638459 in words is "six million, six hundred thirty-eight thousand, four hundred fifty-nine".