6399216 has 40 divisors (see below), whose sum is σ = 18369360. Its totient is φ = 2132928.

The previous prime is 6399209. The next prime is 6399251. The reversal of 6399216 is 6129936.

6399216 is a `hidden beast` number, since 639 + 9 + 2 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

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, 6975 + ... + 7838.

It is an arithmetic number, because the mean of its divisors is an integer number (459234).

Almost surely, 2^6399216 is an apocalyptic number.

It is an amenable number.

6399216 is an abundant number, since it is smaller than the sum of its proper divisors (11970144).

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

6399216 is a wasteful number, since it uses less digits than its factorization.

6399216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14830 (or 14818 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 6399216 is about 2529.6671717837. The cubic root of 6399216 is about 185.6559717732.

The spelling of 6399216 in words is "six million, three hundred ninety-nine thousand, two hundred sixteen".