518820084 has 18 divisors (see below), whose sum is σ = 1311461970. Its totient is φ = 172940016.

The previous prime is 518820083. The next prime is 518820103. The reversal of 518820084 is 480028815.

It can be written as a sum of positive squares in only one way, i.e., 400880484 + 117939600 = 20022^2 + 10860^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 14411669 = 518820084 / (5 + 1 + 8 + 8 + 2 + 0 + 0 + 8 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518820083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7205799 + ... + 7205870.

Almost surely, 2^518820084 is an apocalyptic number.

It is an amenable number.

518820084 is an abundant number, since it is smaller than the sum of its proper divisors (792641886).

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

518820084 is a wasteful number, since it uses less digits than its factorization.

518820084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14411679 (or 14411674 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 518820084 is about 22777.6224395787. The cubic root of 518820084 is about 803.5364707654.

Adding to 518820084 its reverse (480028815), we get a palindrome (998848899).

The spelling of 518820084 in words is "five hundred eighteen million, eight hundred twenty thousand, eighty-four".