6399995 has 8 divisors (see below), whose sum is σ = 8777184. Its totient is φ = 4388544.

The previous prime is 6399971. The next prime is 6400013. The reversal of 6399995 is 5999936.

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 6399995 - 2⁶ = 6399931 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91394 + ... + 91463.

It is an arithmetic number, because the mean of its divisors is an integer number (1097148).

Almost surely, 2^6399995 is an apocalyptic number.

6399995 is a deficient number, since it is larger than the sum of its proper divisors (2377189).

6399995 is a wasteful number, since it uses less digits than its factorization.

6399995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182869.

The product of its digits is 590490, while the sum is 50.

The square root of 6399995 is about 2529.8211399227. The cubic root of 6399995 is about 185.6635049946.

The spelling of 6399995 in words is "six million, three hundred ninety-nine thousand, nine hundred ninety-five".