6399687 has 16 divisors (see below), whose sum is σ = 9808640. Its totient is φ = 3635712.

The previous prime is 6399683. The next prime is 6399689. The reversal of 6399687 is 7869936.

It is a happy number.

It is not a de Polignac number, because 6399687 - 2² = 6399683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3264 + ... + 4842.

It is an arithmetic number, because the mean of its divisors is an integer number (613040).

Almost surely, 2^6399687 is an apocalyptic number.

6399687 is a deficient number, since it is larger than the sum of its proper divisors (3408953).

6399687 is a wasteful number, since it uses less digits than its factorization.

6399687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its digits is 489888, while the sum is 48.

The square root of 6399687 is about 2529.7602653216. The cubic root of 6399687 is about 185.6605265924.

The spelling of 6399687 in words is "six million, three hundred ninety-nine thousand, six hundred eighty-seven".