6638893 has 2 divisors, whose sum is σ = 6638894. Its totient is φ = 6638892.

The previous prime is 6638851. The next prime is 6638903. The reversal of 6638893 is 3988366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4088484 + 2550409 = 2022^2 + 1597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6638893 is a prime.

6638893 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6638803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319446 + 3319447.

It is an arithmetic number, because the mean of its divisors is an integer number (3319447).

Almost surely, 2^6638893 is an apocalyptic number.

It is an amenable number.

6638893 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638893 is an equidigital number, since it uses as much as digits as its factorization.

6638893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 6638893 is about 2576.6049367336. The cubic root of 6638893 is about 187.9454817774.

The spelling of 6638893 in words is "six million, six hundred thirty-eight thousand, eight hundred ninety-three".