320400513 has 24 divisors (see below), whose sum is σ = 492804000. Its totient is φ = 199895424.

The previous prime is 320400491. The next prime is 320400517. The reversal of 320400513 is 315004023.

It is not a de Polignac number, because 320400513 - 2⁸ = 320400257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320400517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21538 + ... + 33236.

It is an arithmetic number, because the mean of its divisors is an integer number (20533500).

Almost surely, 2^320400513 is an apocalyptic number.

It is an amenable number.

320400513 is a deficient number, since it is larger than the sum of its proper divisors (172403487).

320400513 is a wasteful number, since it uses less digits than its factorization.

320400513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11901 (or 11898 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 320400513 is about 17899.7349980384. The cubic root of 320400513 is about 684.2756211987.

Adding to 320400513 its reverse (315004023), we get a palindrome (635404536).

The spelling of 320400513 in words is "three hundred twenty million, four hundred thousand, five hundred thirteen".