998559 has 6 divisors (see below), whose sum is σ = 1442376. Its totient is φ = 665700.

The previous prime is 998551. The next prime is 998561. The reversal of 998559 is 955899.

998559 is a `hidden beast` number, since 9 + 98 + 559 = 666.

It is not a de Polignac number, because 998559 - 2³ = 998551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55467 + ... + 55484.

It is an arithmetic number, because the mean of its divisors is an integer number (240396).

2⁹⁹⁸⁵⁵⁹ is an apocalyptic number.

998559 is a deficient number, since it is larger than the sum of its proper divisors (443817).

998559 is a wasteful number, since it uses less digits than its factorization.

998559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110957 (or 110954 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 998559 is about 999.2792402527. The cubic root of 998559 is about 99.9519435762.

The spelling of 998559 in words is "nine hundred ninety-eight thousand, five hundred fifty-nine".