399868 has 12 divisors (see below), whose sum is σ = 799792. Its totient is φ = 171360.

The previous prime is 399853. The next prime is 399871. The reversal of 399868 is 868993.

399868 is nontrivially palindromic in base 13.

399868 is an admirable number.

It is a zygodrome in base 2 and base 13.

It is a congruent number.

It is an unprimeable number.

399868 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 in 3 ways as a sum of consecutive naturals, for example, 7113 + ... + 7168.

2³⁹⁹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

399868 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

399868 is a wasteful number, since it uses less digits than its factorization.

399868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14292 (or 14290 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 399868 is about 632.3511682602. The cubic root of 399868 is about 73.6725242118.

The spelling of 399868 in words is "three hundred ninety-nine thousand, eight hundred sixty-eight".