320389 has 2 divisors, whose sum is σ = 320390. Its totient is φ = 320388.

The previous prime is 320387. The next prime is 320401. The reversal of 320389 is 983023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311364 + 9025 = 558^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 320389 - 2¹ = 320387 is a prime.

It is a super-2 number, since 2×320389² = 205298222642, which contains 22 as substring.

Together with 320387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160194 + 160195.

It is an arithmetic number, because the mean of its divisors is an integer number (160195).

2³²⁰³⁸⁹ is an apocalyptic number.

It is an amenable number.

320389 is a deficient number, since it is larger than the sum of its proper divisors (1).

320389 is an equidigital number, since it uses as much as digits as its factorization.

320389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 320389 is about 566.0291511928. The cubic root of 320389 is about 68.4267425041.

The spelling of 320389 in words is "three hundred twenty thousand, three hundred eighty-nine".