320540440 has 64 divisors (see below), whose sum is σ = 833081760. Its totient is φ = 109701120.

The previous prime is 320540417. The next prime is 320540453. The reversal of 320540440 is 44045023.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 15 ways as a sum of consecutive naturals, for example, 13947 + ... + 28906.

Almost surely, 2^320540440 is an apocalyptic number.

It is an amenable number.

320540440 is an abundant number, since it is smaller than the sum of its proper divisors (512541320).

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

320540440 is a wasteful number, since it uses less digits than its factorization.

320540440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42892 (or 42888 counting only the distinct ones).

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

The square root of 320540440 is about 17903.6432046665. The cubic root of 320540440 is about 684.3752201858.

Adding to 320540440 its reverse (44045023), we get a palindrome (364585463).

The spelling of 320540440 in words is "three hundred twenty million, five hundred forty thousand, four hundred forty".