320999 has 6 divisors (see below), whose sum is σ = 373464. Its totient is φ = 275100.

The previous prime is 320953. The next prime is 321007. The reversal of 320999 is 999023.

It is not a de Polignac number, because 320999 - 2¹² = 316903 is a prime.

320999 is a modest number, since divided by 999 gives 320 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3227 + ... + 3324.

It is an arithmetic number, because the mean of its divisors is an integer number (62244).

2³²⁰⁹⁹⁹ is an apocalyptic number.

320999 is a deficient number, since it is larger than the sum of its proper divisors (52465).

320999 is an equidigital number, since it uses as much as digits as its factorization.

320999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6565 (or 6558 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 320999 is about 566.5677364623. The cubic root of 320999 is about 68.4701416747.

The spelling of 320999 in words is "three hundred twenty thousand, nine hundred ninety-nine".