320993 has 4 divisors (see below), whose sum is σ = 322500. Its totient is φ = 319488.

The previous prime is 320953. The next prime is 321007. The reversal of 320993 is 399023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 247009 + 73984 = 497^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 320993 - 2¹⁴ = 304609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368 + ... + 881.

It is an arithmetic number, because the mean of its divisors is an integer number (80625).

2³²⁰⁹⁹³ is an apocalyptic number.

It is an amenable number.

320993 is a deficient number, since it is larger than the sum of its proper divisors (1507).

320993 is a wasteful number, since it uses less digits than its factorization.

320993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506.

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

The square root of 320993 is about 566.5624413955. The cubic root of 320993 is about 68.4697150655.

The spelling of 320993 in words is "three hundred twenty thousand, nine hundred ninety-three".