509900 has 18 divisors (see below), whose sum is σ = 1106700. Its totient is φ = 203920.

The previous prime is 509879. The next prime is 509909. The reversal of 509900 is 9905.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (509909) by changing a digit.

509900 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2450 + ... + 2649.

2⁵⁰⁹⁹⁰⁰ is an apocalyptic number.

509900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

509900 is an abundant number, since it is smaller than the sum of its proper divisors (596800).

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

509900 is a wasteful number, since it uses less digits than its factorization.

509900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5113 (or 5106 counting only the distinct ones).

The product of its (nonzero) digits is 405, while the sum is 23.

The square root of 509900 is about 714.0728254177. The cubic root of 509900 is about 79.8904751222.

The spelling of 509900 in words is "five hundred nine thousand, nine hundred".