331306340 has 24 divisors (see below), whose sum is σ = 696625272. Its totient is φ = 132354560.

The previous prime is 331306333. The next prime is 331306343. The reversal of 331306340 is 43603133.

It can be written as a sum of positive squares in 4 ways, for example, as 29658916 + 301647424 = 5446^2 + 17368^2 .

It is not an unprimeable number, because it can be changed into a prime (331306343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6332 + ... + 26508.

It is an arithmetic number, because the mean of its divisors is an integer number (29026053).

Almost surely, 2^331306340 is an apocalyptic number.

It is an amenable number.

331306340 is an abundant number, since it is smaller than the sum of its proper divisors (365318932).

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

331306340 is a wasteful number, since it uses less digits than its factorization.

331306340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21007 (or 21005 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 23.

The square root of 331306340 is about 18201.8224362287. The cubic root of 331306340 is about 691.9529771917.

Adding to 331306340 its reverse (43603133), we get a palindrome (374909473).

The spelling of 331306340 in words is "three hundred thirty-one million, three hundred six thousand, three hundred forty".