320131218 has 32 divisors (see below), whose sum is σ = 701632512. Its totient is φ = 96570000.

The previous prime is 320131211. The next prime is 320131219. The reversal of 320131218 is 812131023.

It is a junction number, because it is equal to n+sod(n) for n = 320131194 and 320131203.

It is not an unprimeable number, because it can be changed into a prime (320131211) 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 15 ways as a sum of consecutive naturals, for example, 3843 + ... + 25593.

It is an arithmetic number, because the mean of its divisors is an integer number (21926016).

Almost surely, 2^320131218 is an apocalyptic number.

320131218 is an abundant number, since it is smaller than the sum of its proper divisors (381501294).

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

320131218 is a wasteful number, since it uses less digits than its factorization.

320131218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21990.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 320131218 is about 17892.2110986876. The cubic root of 320131218 is about 684.0838574046.

The spelling of 320131218 in words is "three hundred twenty million, one hundred thirty-one thousand, two hundred eighteen".