320985 has 24 divisors (see below), whose sum is σ = 636480. Its totient is φ = 146592.

The previous prime is 320953. The next prime is 321007. The reversal of 320985 is 589023.

It is not a de Polignac number, because 320985 - 2⁵ = 320953 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320985.

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 23 ways as a sum of consecutive naturals, for example, 195 + ... + 824.

It is an arithmetic number, because the mean of its divisors is an integer number (26520).

2³²⁰⁹⁸⁵ is an apocalyptic number.

320985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320985 is a deficient number, since it is larger than the sum of its proper divisors (315495).

320985 is a wasteful number, since it uses less digits than its factorization.

320985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1034 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 320985 is about 566.5553812294. Note that the first 3 decimals coincide. The cubic root of 320985 is about 68.4691462449.

The spelling of 320985 in words is "three hundred twenty thousand, nine hundred eighty-five".