320997 has 8 divisors (see below), whose sum is σ = 434656. Its totient is φ = 210672.

The previous prime is 320953. The next prime is 321007. The reversal of 320997 is 799023.

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

It is not a de Polignac number, because 320997 - 2⁸ = 320741 is a prime.

It is a Duffinian number.

320997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320927) 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, 598 + ... + 999.

It is an arithmetic number, because the mean of its divisors is an integer number (54332).

2³²⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

320997 is a deficient number, since it is larger than the sum of its proper divisors (113659).

320997 is a wasteful number, since it uses less digits than its factorization.

320997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 320997 is about 566.5659714455. The cubic root of 320997 is about 68.4699994722.

The spelling of 320997 in words is "three hundred twenty thousand, nine hundred ninety-seven".