320400312 has 64 divisors (see below), whose sum is σ = 814144800. Its totient is φ = 105062400.

The previous prime is 320400307. The next prime is 320400329. The reversal of 320400312 is 213004023.

It is a junction number, because it is equal to n+sod(n) for n = 320400291 and 320400300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532812 + ... + 533412.

Almost surely, 2^320400312 is an apocalyptic number.

It is an amenable number.

320400312 is an abundant number, since it is smaller than the sum of its proper divisors (493744488).

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

320400312 is a wasteful number, since it uses less digits than its factorization.

320400312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 320400312 is about 17899.7293834292. The cubic root of 320400312 is about 684.2754781076.

Adding to 320400312 its reverse (213004023), we get a palindrome (533404335).

The spelling of 320400312 in words is "three hundred twenty million, four hundred thousand, three hundred twelve".