509998 has 8 divisors (see below), whose sum is σ = 805320. Its totient is φ = 241560.

The previous prime is 509989. The next prime is 510007. The reversal of 509998 is 899905.

It is an interprime number because it is at equal distance from previous prime (509989) and next prime (510007).

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

It is a self number, because there is not a number n which added to its sum of digits gives 509998.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 509998.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6673 + ... + 6748.

It is an arithmetic number, because the mean of its divisors is an integer number (100665).

2⁵⁰⁹⁹⁹⁸ is an apocalyptic number.

509998 is a deficient number, since it is larger than the sum of its proper divisors (295322).

509998 is a wasteful number, since it uses less digits than its factorization.

509998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13442.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 509998 is about 714.1414425728. The cubic root of 509998 is about 79.8955929656.

The spelling of 509998 in words is "five hundred nine thousand, nine hundred ninety-eight".