320440540 has 24 divisors (see below), whose sum is σ = 769057632. Its totient is φ = 109865280.

The previous prime is 320440493. The next prime is 320440553. The reversal of 320440540 is 45044023.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1144291 + ... + 1144570.

It is an arithmetic number, because the mean of its divisors is an integer number (32044068).

Almost surely, 2^320440540 is an apocalyptic number.

It is an amenable number.

320440540 is an abundant number, since it is smaller than the sum of its proper divisors (448617092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320440540 is a wasteful number, since it uses less digits than its factorization.

320440540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288877 (or 2288875 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 320440540 is about 17900.8530522989. The cubic root of 320440540 is about 684.3041150772.

Adding to 320440540 its reverse (45044023), we get a palindrome (365484563).

The spelling of 320440540 in words is "three hundred twenty million, four hundred forty thousand, five hundred forty".