6399908 has 6 divisors (see below), whose sum is σ = 11199846. Its totient is φ = 3199952.

The previous prime is 6399889. The next prime is 6399917. The reversal of 6399908 is 8099936.

It can be written as a sum of positive squares in only one way, i.e., 6190144 + 209764 = 2488^2 + 458^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 799985 + ... + 799992.

It is an arithmetic number, because the mean of its divisors is an integer number (1866641).

Almost surely, 2^6399908 is an apocalyptic number.

It is an amenable number.

6399908 is a deficient number, since it is larger than the sum of its proper divisors (4799938).

6399908 is a wasteful number, since it uses less digits than its factorization.

6399908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599981 (or 1599979 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 6399908 is about 2529.8039449728. The cubic root of 6399908 is about 185.6626637024.

The spelling of 6399908 in words is "six million, three hundred ninety-nine thousand, nine hundred eight".