505998 has 12 divisors (see below), whose sum is σ = 1096368. Its totient is φ = 168660.

The previous prime is 505979. The next prime is 506047. The reversal of 505998 is 899505.

It is a congruent number.

It is an unprimeable number.

505998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14038 + ... + 14073.

It is an arithmetic number, because the mean of its divisors is an integer number (91364).

2⁵⁰⁵⁹⁹⁸ is an apocalyptic number.

505998 is an abundant number, since it is smaller than the sum of its proper divisors (590370).

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

505998 is a wasteful number, since it uses less digits than its factorization.

505998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28119 (or 28116 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 505998 is about 711.3353639459. The cubic root of 505998 is about 79.6861662983.

The spelling of 505998 in words is "five hundred five thousand, nine hundred ninety-eight".