320945 has 4 divisors (see below), whose sum is σ = 385140. Its totient is φ = 256752.

The previous prime is 320941. The next prime is 320953. The reversal of 320945 is 549023.

320945 is nontrivially palindromic in base 4.

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 167281 + 153664 = 409^2 + 392^2 .

It is a cyclic number.

It is not a de Polignac number, because 320945 - 2² = 320941 is a prime.

It is a d-powerful number, because it can be written as 3¹¹ + 2⁷ + 9 + 0 + 4⁸ + 5⁷ .

It is a Curzon number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 320945.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320945.

It is not an unprimeable number, because it can be changed into a prime (320941) 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, 32090 + ... + 32099.

It is an arithmetic number, because the mean of its divisors is an integer number (96285).

2³²⁰⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

320945 is a deficient number, since it is larger than the sum of its proper divisors (64195).

320945 is an equidigital number, since it uses as much as digits as its factorization.

320945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64194.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 320945 is about 566.5200790793. The cubic root of 320945 is about 68.4663020002.

Adding to 320945 its reverse (549023), we get a palindrome (869968).

It can be divided in two parts, 3 and 20945, that multiplied together give a triangular number (62835 = T₃₅₄).

The spelling of 320945 in words is "three hundred twenty thousand, nine hundred forty-five".