320989 has 4 divisors (see below), whose sum is σ = 328860. Its totient is φ = 313120.

The previous prime is 320953. The next prime is 321007. The reversal of 320989 is 989023.

It is a happy number.

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 27225 + 293764 = 165^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 320989 - 2⁷ = 320861 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

320989 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 320989.

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 3 ways as a sum of consecutive naturals, for example, 3874 + ... + 3955.

It is an arithmetic number, because the mean of its divisors is an integer number (82215).

2³²⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

320989 is a deficient number, since it is larger than the sum of its proper divisors (7871).

320989 is an equidigital number, since it uses as much as digits as its factorization.

320989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7870.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 320989 is about 566.5589113234. The cubic root of 320989 is about 68.4694306564.

It can be divided in two parts, 32098 and 9, that multiplied together give a palindrome (288882).

The spelling of 320989 in words is "three hundred twenty thousand, nine hundred eighty-nine".