518226818 has 6 divisors (see below), whose sum is σ = 777388521. Its totient is φ = 259097312.

The previous prime is 518226817. The next prime is 518226829. The reversal of 518226818 is 818622815.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 515153809 + 3073009 = 22697^2 + 1753^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=16097.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518226817) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 24146 + ... + 40242.

Almost surely, 2^518226818 is an apocalyptic number.

518226818 is a deficient number, since it is larger than the sum of its proper divisors (259161703).

518226818 is an frugal number, since it uses more digits than its factorization.

518226818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32196 (or 16099 counting only the distinct ones).

The product of its digits is 61440, while the sum is 41.

The square root of 518226818 is about 22764.5957135197. The cubic root of 518226818 is about 803.2300750912.

The spelling of 518226818 in words is "five hundred eighteen million, two hundred twenty-six thousand, eight hundred eighteen".