6397945 has 8 divisors (see below), whose sum is σ = 7702344. Its totient is φ = 5101824.

The previous prime is 6397921. The next prime is 6397949. The reversal of 6397945 is 5497936.

It can be written as a sum of positive squares in 4 ways, for example, as 112896 + 6285049 = 336^2 + 2507^2 .

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 6397945 - 2⁷ = 6397817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6397949) 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, 214 + ... + 3583.

It is an arithmetic number, because the mean of its divisors is an integer number (962793).

Almost surely, 2^6397945 is an apocalyptic number.

It is an amenable number.

6397945 is a deficient number, since it is larger than the sum of its proper divisors (1304399).

6397945 is a wasteful number, since it uses less digits than its factorization.

6397945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139.

The product of its digits is 204120, while the sum is 43.

The square root of 6397945 is about 2529.4159404890. The cubic root of 6397945 is about 185.6436794150.

Subtracting from 6397945 its reverse (5497936), we obtain a palindrome (900009).

The spelling of 6397945 in words is "six million, three hundred ninety-seven thousand, nine hundred forty-five".