518993 has 4 divisors (see below), whose sum is σ = 549540. Its totient is φ = 488448.

The previous prime is 518989. The next prime is 519011. The reversal of 518993 is 399815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150544 + 368449 = 388^2 + 607^2 .

It is a cyclic number.

It is not a de Polignac number, because 518993 - 2² = 518989 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 518993.

It is not an unprimeable number, because it can be changed into a prime (518933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15248 + ... + 15281.

It is an arithmetic number, because the mean of its divisors is an integer number (137385).

2⁵¹⁸⁹⁹³ is an apocalyptic number.

It is an amenable number.

518993 is a deficient number, since it is larger than the sum of its proper divisors (30547).

518993 is a wasteful number, since it uses less digits than its factorization.

518993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30546.

The product of its digits is 9720, while the sum is 35.

The square root of 518993 is about 720.4116878563. The cubic root of 518993 is about 80.3625730275.

The spelling of 518993 in words is "five hundred eighteen thousand, nine hundred ninety-three".