320400313 has 4 divisors (see below), whose sum is σ = 323235828. Its totient is φ = 317564800.

The previous prime is 320400307. The next prime is 320400329. The reversal of 320400313 is 313004023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97555129 + 222845184 = 9877^2 + 14928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320400313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320400383) 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, 1417588 + ... + 1417813.

It is an arithmetic number, because the mean of its divisors is an integer number (80808957).

Almost surely, 2^320400313 is an apocalyptic number.

It is an amenable number.

320400313 is a deficient number, since it is larger than the sum of its proper divisors (2835515).

320400313 is a wasteful number, since it uses less digits than its factorization.

320400313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835514.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 320400313 is about 17899.7294113626. The cubic root of 320400313 is about 684.2754788195.

Adding to 320400313 its reverse (313004023), we get a palindrome (633404336).

The spelling of 320400313 in words is "three hundred twenty million, four hundred thousand, three hundred thirteen".