6399996 has 24 divisors (see below), whose sum is σ = 15002064. Its totient is φ = 2123520.

The previous prime is 6399971. The next prime is 6400013. The reversal of 6399996 is 6999936.

It is a congruent 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, 1786 + ... + 3998.

It is an arithmetic number, because the mean of its divisors is an integer number (625086).

Almost surely, 2^6399996 is an apocalyptic number.

It is an amenable number.

6399996 is an abundant number, since it is smaller than the sum of its proper divisors (8602068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6399996 is a wasteful number, since it uses less digits than its factorization.

6399996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461 (or 2459 counting only the distinct ones).

The product of its digits is 708588, while the sum is 51.

The square root of 6399996 is about 2529.8213375652. The cubic root of 6399996 is about 185.6635146646.

The spelling of 6399996 in words is "six million, three hundred ninety-nine thousand, nine hundred ninety-six".