6397997 has 8 divisors (see below), whose sum is σ = 6647040. Its totient is φ = 6151680.

The previous prime is 6397991. The next prime is 6397999. The reversal of 6397997 is 7997936.

It is a happy number.

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 6397997 - 2⁴ = 6397981 is a prime.

It is a super-2 number, since 2×6397997² = 81868731224018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6397991) 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, 4973 + ... + 6125.

It is an arithmetic number, because the mean of its divisors is an integer number (830880).

Almost surely, 2^6397997 is an apocalyptic number.

It is an amenable number.

6397997 is a deficient number, since it is larger than the sum of its proper divisors (249043).

6397997 is a wasteful number, since it uses less digits than its factorization.

6397997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363.

The product of its digits is 642978, while the sum is 50.

The square root of 6397997 is about 2529.4262195209. The cubic root of 6397997 is about 185.6441823601.

The spelling of 6397997 in words is "six million, three hundred ninety-seven thousand, nine hundred ninety-seven".