320404040 has 32 divisors (see below), whose sum is σ = 786447360. Its totient is φ = 116510400.

The previous prime is 320404039. The next prime is 320404067. The reversal of 320404040 is 40404023.

320404040 is a modest number, since divided by 404040 gives 320 as remainder.

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, 363656 + ... + 364535.

It is an arithmetic number, because the mean of its divisors is an integer number (24576480).

Almost surely, 2^320404040 is an apocalyptic number.

It is an amenable number.

320404040 is an abundant number, since it is smaller than the sum of its proper divisors (466043320).

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

320404040 is a wasteful number, since it uses less digits than its factorization.

320404040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728213 (or 728209 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 320404040 is about 17899.8335187789. The cubic root of 320404040 is about 684.2781320471.

Subtracting from 320404040 its sum of digits (17), we obtain a palindrome (320404023).

Adding to 320404040 its reverse (40404023), we get a palindrome (360808063).

The spelling of 320404040 in words is "three hundred twenty million, four hundred four thousand, forty".