509946 has 8 divisors (see below), whose sum is σ = 1019904. Its totient is φ = 169980.

The previous prime is 509939. The next prime is 509947. The reversal of 509946 is 649905.

It is a happy number.

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

509946 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (509947) by changing a digit.

509946 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 3 ways as a sum of consecutive naturals, for example, 42490 + ... + 42501.

It is an arithmetic number, because the mean of its divisors is an integer number (127488).

2⁵⁰⁹⁹⁴⁶ is an apocalyptic number.

509946 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

509946 is a wasteful number, since it uses less digits than its factorization.

509946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84996.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 509946 is about 714.1050342912. The cubic root of 509946 is about 79.8928774569.

The spelling of 509946 in words is "five hundred nine thousand, nine hundred forty-six".