399085 has 4 divisors (see below), whose sum is σ = 478908. Its totient is φ = 319264.

The previous prime is 399079. The next prime is 399097. The reversal of 399085 is 580993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 328329 = 266^2 + 573^2 .

It is a cyclic number.

It is not a de Polignac number, because 399085 - 2¹¹ = 397037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399085.

It is a congruent number.

It is an unprimeable 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, 39904 + ... + 39913.

It is an arithmetic number, because the mean of its divisors is an integer number (119727).

2³⁹⁹⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

399085 is a deficient number, since it is larger than the sum of its proper divisors (79823).

399085 is an equidigital number, since it uses as much as digits as its factorization.

399085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79822.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 399085 is about 631.7317468673. The cubic root of 399085 is about 73.6244055996.

The spelling of 399085 in words is "three hundred ninety-nine thousand, eighty-five".