320009 has 2 divisors, whose sum is σ = 320010. Its totient is φ = 320008.

The previous prime is 319993. The next prime is 320011. The reversal of 320009 is 900023.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319225 + 784 = 565^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 320009 - 2⁴ = 319993 is a prime.

It is a Sophie Germain prime.

Together with 320011, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 319975 and 320002.

It is not a weakly prime, because it can be changed into another prime (320039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160004 + 160005.

It is an arithmetic number, because the mean of its divisors is an integer number (160005).

2³²⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

320009 is a deficient number, since it is larger than the sum of its proper divisors (1).

320009 is an equidigital number, since it uses as much as digits as its factorization.

320009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 320009 is about 565.6933798446. The cubic root of 320009 is about 68.3996791020.

Adding to 320009 its sum of digits (14), we get a palindrome (320023).

The spelling of 320009 in words is "three hundred twenty thousand, nine".