998109 has 16 divisors (see below), whose sum is σ = 1690240. Its totient is φ = 570240.

The previous prime is 998083. The next prime is 998111. The reversal of 998109 is 901899.

It is not a de Polignac number, because 998109 - 2⁵ = 998077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2452 + ... + 2829.

It is an arithmetic number, because the mean of its divisors is an integer number (105640).

2⁹⁹⁸¹⁰⁹ is an apocalyptic number.

It is an amenable number.

998109 is a deficient number, since it is larger than the sum of its proper divisors (692131).

998109 is a wasteful number, since it uses less digits than its factorization.

998109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297 (or 5291 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 998109 is about 999.0540525918. The cubic root of 998109 is about 99.9369268929.

The spelling of 998109 in words is "nine hundred ninety-eight thousand, one hundred nine".