320399 has 8 divisors (see below), whose sum is σ = 347328. Its totient is φ = 294400.

The previous prime is 320389. The next prime is 320401. The reversal of 320399 is 993023.

320399 is nontrivially palindromic in base 7.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320399 - 2⁸ = 320143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320399.

It is not an unprimeable number, because it can be changed into a prime (320329) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 599 + ... + 999.

It is an arithmetic number, because the mean of its divisors is an integer number (43416).

2³²⁰³⁹⁹ is an apocalyptic number.

320399 is a deficient number, since it is larger than the sum of its proper divisors (26929).

320399 is a wasteful number, since it uses less digits than its factorization.

320399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 320399 is about 566.0379845911. The cubic root of 320399 is about 68.4274544098.

It can be divided in two parts, 3 and 20399, that added together give a palindrome (20402).

The spelling of 320399 in words is "three hundred twenty thousand, three hundred ninety-nine".