320043040 has 24 divisors (see below), whose sum is σ = 756102060. Its totient is φ = 128017152.

The previous prime is 320043029. The next prime is 320043047. The reversal of 320043040 is 40340023.

It can be written as a sum of positive squares in 2 ways, for example, as 306530064 + 13512976 = 17508^2 + 3676^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (320043047) by changing a digit.

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, 999975 + ... + 1000294.

Almost surely, 2^320043040 is an apocalyptic number.

It is an amenable number.

320043040 is an abundant number, since it is smaller than the sum of its proper divisors (436059020).

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

320043040 is a wasteful number, since it uses less digits than its factorization.

320043040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000284 (or 2000276 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 320043040 is about 17889.7467841219. The cubic root of 320043040 is about 684.0210428646.

Adding to 320043040 its reverse (40340023), we get a palindrome (360383063).

The spelling of 320043040 in words is "three hundred twenty million, forty-three thousand, forty".