6639794 has 16 divisors (see below), whose sum is σ = 11616000. Its totient is φ = 2845332.

The previous prime is 6639769. The next prime is 6639799. The reversal of 6639794 is 4979366.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4154 + ... + 5525.

It is an arithmetic number, because the mean of its divisors is an integer number (726000).

Almost surely, 2^6639794 is an apocalyptic number.

6639794 is a deficient number, since it is larger than the sum of its proper divisors (4976206).

6639794 is an equidigital number, since it uses as much as digits as its factorization.

6639794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9702 (or 9688 counting only the distinct ones).

The product of its digits is 244944, while the sum is 44.

The square root of 6639794 is about 2576.7797732829. The cubic root of 6639794 is about 187.9539837580.

The spelling of 6639794 in words is "six million, six hundred thirty-nine thousand, seven hundred ninety-four".