518221336 has 64 divisors (see below), whose sum is σ = 1050144480. Its totient is φ = 238878720.

The previous prime is 518221331. The next prime is 518221339. The reversal of 518221336 is 633122815.

It is a junction number, because it is equal to n+sod(n) for n = 518221298 and 518221307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518221331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2150176 + ... + 2150416.

Almost surely, 2^518221336 is an apocalyptic number.

It is an amenable number.

518221336 is an abundant number, since it is smaller than the sum of its proper divisors (531923144).

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

518221336 is a wasteful number, since it uses less digits than its factorization.

518221336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 520 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 518221336 is about 22764.4753069338. The cubic root of 518221336 is about 803.2272427904.

The spelling of 518221336 in words is "five hundred eighteen million, two hundred twenty-one thousand, three hundred thirty-six".