518 has 8 divisors (see below), whose sum is σ = 912. Its totient is φ = 216.

The previous prime is 509. The next prime is 521. The reversal of 518 is 815.

518 is nontrivially palindromic in base 6.

518 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (14), and also a Moran number because the ratio is a prime number: 37 = 518 / (5 + 1 + 8).

It is a magnanimous number.

It is a d-powerful number, because it can be written as **5** + **1** + **8**^{3} .

518 is a nontrivial repdigit in base 6.

It is a plaindrome in base 6 and base 15.

It is a nialpdrome in base 6 and base 11.

It is a zygodrome in base 6.

It is a congruent number.

It is an unprimeable number.

518 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5 + ... + 32.

It is an arithmetic number, because the mean of its divisors is an integer number (114).

518 is a deficient number, since it is larger than the sum of its proper divisors (394).

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

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

The sum of its prime factors is 46.

The product of its digits is 40, while the sum is 14.

The square root of 518 is about 22.7596133535. The cubic root of 518 is about 8.0311287183.

The spelling of 518 in words is "five hundred eighteen", and is thus an aban number and an oban number.

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