6399165 has 8 divisors (see below), whose sum is σ = 10238688. Its totient is φ = 3412880.

The previous prime is 6399161. The next prime is 6399193. The reversal of 6399165 is 5619936.

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

It is not a de Polignac number, because 6399165 - 2² = 6399161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399161) 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, 213291 + ... + 213320.

It is an arithmetic number, because the mean of its divisors is an integer number (1279836).

Almost surely, 2^6399165 is an apocalyptic number.

It is an amenable number.

6399165 is a deficient number, since it is larger than the sum of its proper divisors (3839523).

6399165 is a wasteful number, since it uses less digits than its factorization.

6399165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426619.

The product of its digits is 43740, while the sum is 39.

The square root of 6399165 is about 2529.6570913861. The cubic root of 6399165 is about 185.6554785628.

It can be divided in two parts, 6 and 399165, that added together give a triangular number (399171 = T₈₉₃).

The spelling of 6399165 in words is "six million, three hundred ninety-nine thousand, one hundred sixty-five".