399345 has 16 divisors (see below), whose sum is σ = 648960. Its totient is φ = 209664.

The previous prime is 399283. The next prime is 399353. The reversal of 399345 is 543993.

It is not a de Polignac number, because 399345 - 2⁶ = 399281 is a prime.

It is a d-powerful number, because it can be written as 3² + 9 + 3¹⁰ + 9 + 4⁹ + 5⁷ .

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 1017 + ... + 1353.

It is an arithmetic number, because the mean of its divisors is an integer number (40560).

2³⁹⁹³⁴⁵ is an apocalyptic number.

It is an amenable number.

399345 is a deficient number, since it is larger than the sum of its proper divisors (249615).

399345 is a wasteful number, since it uses less digits than its factorization.

399345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424.

The product of its digits is 14580, while the sum is 33.

The square root of 399345 is about 631.9374969093. The cubic root of 399345 is about 73.6403906570.

The spelling of 399345 in words is "three hundred ninety-nine thousand, three hundred forty-five".