6399128 has 8 divisors (see below), whose sum is σ = 11998380. Its totient is φ = 3199560.

The previous prime is 6399119. The next prime is 6399137. The reversal of 6399128 is 8219936.

It is an interprime number because it is at equal distance from previous prime (6399119) and next prime (6399137).

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 6399091 and 6399100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399938 + ... + 399953.

Almost surely, 2^6399128 is an apocalyptic number.

It is an amenable number.

6399128 is a deficient number, since it is larger than the sum of its proper divisors (5599252).

6399128 is a wasteful number, since it uses less digits than its factorization.

6399128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799897 (or 799893 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 6399128 is about 2529.6497781314. The cubic root of 6399128 is about 185.6551207418.

The spelling of 6399128 in words is "six million, three hundred ninety-nine thousand, one hundred twenty-eight".