320440345 has 4 divisors (see below), whose sum is σ = 384528420. Its totient is φ = 256352272.

The previous prime is 320440319. The next prime is 320440391. The reversal of 320440345 is 543044023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543044023 = 1949 ⋅278627.

It can be written as a sum of positive squares in 2 ways, for example, as 68773849 + 251666496 = 8293^2 + 15864^2 .

It is a cyclic number.

It is not a de Polignac number, because 320440345 - 2⁷ = 320440217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32044030 + ... + 32044039.

It is an arithmetic number, because the mean of its divisors is an integer number (96132105).

Almost surely, 2^320440345 is an apocalyptic number.

It is an amenable number.

320440345 is a deficient number, since it is larger than the sum of its proper divisors (64088075).

320440345 is an equidigital number, since it uses as much as digits as its factorization.

320440345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64088074.

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 320440345 is about 17900.8476056303. The cubic root of 320440345 is about 684.3039762690.

Adding to 320440345 its reverse (543044023), we get a palindrome (863484368).

The spelling of 320440345 in words is "three hundred twenty million, four hundred forty thousand, three hundred forty-five".