320445 has 12 divisors (see below), whose sum is σ = 555516. Its totient is φ = 170880.

The previous prime is 320431. The next prime is 320449. The reversal of 320445 is 544023.

It is a happy number.

320445 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 47961 + 272484 = 219^2 + 522^2 .

It is not a de Polignac number, because 320445 - 2⁷ = 320317 is a prime.

320445 is strictly pandigital in base 7.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3516 + ... + 3605.

It is an arithmetic number, because the mean of its divisors is an integer number (46293).

2³²⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

320445 is a deficient number, since it is larger than the sum of its proper divisors (235071).

320445 is a wasteful number, since it uses less digits than its factorization.

320445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7132 (or 7129 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 320445 is about 566.0786164483. The cubic root of 320445 is about 68.4307289855.

Adding to 320445 its reverse (544023), we get a palindrome (864468).

It can be divided in two parts, 3204 and 45, that added together give a square (3249 = 57²).

The spelling of 320445 in words is "three hundred twenty thousand, four hundred forty-five".