505018 has 4 divisors (see below), whose sum is σ = 757530. Its totient is φ = 252508.

The previous prime is 504991. The next prime is 505027. The reversal of 505018 is 810505.

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

It can be written as a sum of positive squares in only one way, i.e., 400689 + 104329 = 633^2 + 323^2 .

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 504986 and 505004.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126253 + ... + 126256.

2⁵⁰⁵⁰¹⁸ is an apocalyptic number.

505018 is a deficient number, since it is larger than the sum of its proper divisors (252512).

505018 is a wasteful number, since it uses less digits than its factorization.

505018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252511.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 505018 is about 710.6461848205. The cubic root of 505018 is about 79.6346885501.

The spelling of 505018 in words is "five hundred five thousand, eighteen".