6397791 has 8 divisors (see below), whose sum is σ = 8567040. Its totient is φ = 4246872.

The previous prime is 6397771. The next prime is 6397817. The reversal of 6397791 is 1977936.

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

It is not a de Polignac number, because 6397791 - 2⁵ = 6397759 is a prime.

6397791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6397751) 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, 3745 + ... + 5178.

It is an arithmetic number, because the mean of its divisors is an integer number (1070880).

Almost surely, 2^6397791 is an apocalyptic number.

6397791 is a deficient number, since it is larger than the sum of its proper divisors (2169249).

6397791 is a wasteful number, since it uses less digits than its factorization.

6397791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9165.

The product of its digits is 71442, while the sum is 42.

The square root of 6397791 is about 2529.3854984956. The cubic root of 6397791 is about 185.6421899078.

The spelling of 6397791 in words is "six million, three hundred ninety-seven thousand, seven hundred ninety-one".