998500 has 24 divisors (see below), whose sum is σ = 2181816. Its totient is φ = 399200.

The previous prime is 998497. The next prime is 998513. The reversal of 998500 is 5899.

It can be written as a sum of positive squares in 4 ways, for example, as 252004 + 746496 = 502^2 + 864^2 .

It is a nialpdrome in base 10.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 499 + ... + 1498.

It is an arithmetic number, because the mean of its divisors is an integer number (90909).

2⁹⁹⁸⁵⁰⁰ is an apocalyptic number.

998500 is the 500-th decagonal number.

It is an amenable number.

998500 is an abundant number, since it is smaller than the sum of its proper divisors (1183316).

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

998500 is a wasteful number, since it uses less digits than its factorization.

998500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 998500 is about 999.2497185389. The cubic root of 998500 is about 99.9499749791.

The spelling of 998500 in words is "nine hundred ninety-eight thousand, five hundred".