320143312 has 20 divisors (see below), whose sum is σ = 652924480. Its totient is φ = 151646688.

The previous prime is 320143309. The next prime is 320143319. The reversal of 320143312 is 213341023.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 320143312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320143319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526248 + ... + 526855.

It is an arithmetic number, because the mean of its divisors is an integer number (32646224).

Almost surely, 2^320143312 is an apocalyptic number.

It is an amenable number.

320143312 is an abundant number, since it is smaller than the sum of its proper divisors (332781168).

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

320143312 is a wasteful number, since it uses less digits than its factorization.

320143312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053130 (or 1053124 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 320143312 is about 17892.5490637863. The cubic root of 320143312 is about 684.0924717951.

Adding to 320143312 its reverse (213341023), we get a palindrome (533484335).

The spelling of 320143312 in words is "three hundred twenty million, one hundred forty-three thousand, three hundred twelve".