399885 has 16 divisors (see below), whose sum is σ = 653184. Its totient is φ = 208832.

The previous prime is 399871. The next prime is 399887. The reversal of 399885 is 588993.

It is a cyclic number.

It is not a de Polignac number, because 399885 - 2⁵ = 399853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399887) 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, 544 + ... + 1046.

It is an arithmetic number, because the mean of its divisors is an integer number (40824).

2³⁹⁹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

399885 is a deficient number, since it is larger than the sum of its proper divisors (253299).

399885 is a wasteful number, since it uses less digits than its factorization.

399885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its digits is 77760, while the sum is 42.

The square root of 399885 is about 632.3646100155. The cubic root of 399885 is about 73.6735682356.

It can be divided in two parts, 39988 and 5, that added together give a palindrome (39993).

The spelling of 399885 in words is "three hundred ninety-nine thousand, eight hundred eighty-five".