6639797 has 8 divisors (see below), whose sum is σ = 7215360. Its totient is φ = 6086880.

The previous prime is 6639769. The next prime is 6639799. The reversal of 6639797 is 7979366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6639797 - 2¹⁰ = 6638773 is a prime.

It is a Duffinian 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5048 + ... + 6225.

It is an arithmetic number, because the mean of its divisors is an integer number (901920).

Almost surely, 2^6639797 is an apocalyptic number.

It is an amenable number.

6639797 is a deficient number, since it is larger than the sum of its proper divisors (575563).

6639797 is a wasteful number, since it uses less digits than its factorization.

6639797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11323.

The product of its digits is 428652, while the sum is 47.

The square root of 6639797 is about 2576.7803554048. The cubic root of 6639797 is about 187.9540120652.

The spelling of 6639797 in words is "six million, six hundred thirty-nine thousand, seven hundred ninety-seven".