6393997 has 4 divisors (see below), whose sum is σ = 6481660. Its totient is φ = 6306336.

The previous prime is 6393983. The next prime is 6394009. The reversal of 6393997 is 7993936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2653641 + 3740356 = 1629^2 + 1934^2 .

It is a cyclic number.

It is not a de Polignac number, because 6393997 - 2⁷ = 6393869 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 (6393917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43722 + ... + 43867.

It is an arithmetic number, because the mean of its divisors is an integer number (1620415).

Almost surely, 2^6393997 is an apocalyptic number.

It is an amenable number.

6393997 is a deficient number, since it is larger than the sum of its proper divisors (87663).

6393997 is an equidigital number, since it uses as much as digits as its factorization.

6393997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87662.

The product of its digits is 275562, while the sum is 46.

The square root of 6393997 is about 2528.6354027420. The cubic root of 6393997 is about 185.6054863154.

The spelling of 6393997 in words is "six million, three hundred ninety-three thousand, nine hundred ninety-seven".