6399894 has 16 divisors (see below), whose sum is σ = 13241520. Its totient is φ = 2059680.

The previous prime is 6399889. The next prime is 6399917. The reversal of 6399894 is 4989936.

It is a happy number.

It is a super-2 number, since 2×6399894² = 81917286422472, which contains 22 as substring.

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, 18217 + ... + 18564.

It is an arithmetic number, because the mean of its divisors is an integer number (827595).

Almost surely, 2^6399894 is an apocalyptic number.

6399894 is an abundant number, since it is smaller than the sum of its proper divisors (6841626).

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

6399894 is a wasteful number, since it uses less digits than its factorization.

6399894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36815.

The product of its digits is 419904, while the sum is 48.

The square root of 6399894 is about 2529.8011779585. The cubic root of 6399894 is about 185.6625283213.

The spelling of 6399894 in words is "six million, three hundred ninety-nine thousand, eight hundred ninety-four".