6397665 has 16 divisors (see below), whose sum is σ = 10411200. Its totient is φ = 3353792.

The previous prime is 6397649. The next prime is 6397667. The reversal of 6397665 is 5667936.

It is a cyclic number.

It is not a de Polignac number, because 6397665 - 2⁴ = 6397649 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6397667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2730 + ... + 4499.

It is an arithmetic number, because the mean of its divisors is an integer number (650700).

Almost surely, 2^6397665 is an apocalyptic number.

It is an amenable number.

6397665 is a deficient number, since it is larger than the sum of its proper divisors (4013535).

6397665 is a wasteful number, since it uses less digits than its factorization.

6397665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7296.

The product of its digits is 204120, while the sum is 42.

The square root of 6397665 is about 2529.3605911376. The cubic root of 6397665 is about 185.6409712023.

The spelling of 6397665 in words is "six million, three hundred ninety-seven thousand, six hundred sixty-five".