509955 has 8 divisors (see below), whose sum is σ = 815952. Its totient is φ = 271968.

The previous prime is 509947. The next prime is 509959. The reversal of 509955 is 559905.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 509955 - 2³ = 509947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (509959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16984 + ... + 17013.

It is an arithmetic number, because the mean of its divisors is an integer number (101994).

2⁵⁰⁹⁹⁵⁵ is an apocalyptic number.

509955 is a deficient number, since it is larger than the sum of its proper divisors (305997).

509955 is a wasteful number, since it uses less digits than its factorization.

509955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34005.

The product of its (nonzero) digits is 10125, while the sum is 33.

The square root of 509955 is about 714.1113358574. Note that the first 3 decimals coincide. The cubic root of 509955 is about 79.8933474620.

The spelling of 509955 in words is "five hundred nine thousand, nine hundred fifty-five".