998198 has 4 divisors (see below), whose sum is σ = 1497300. Its totient is φ = 499098.

The previous prime is 998197. The next prime is 998201. The reversal of 998198 is 891899.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249548 + ... + 249551.

It is an arithmetic number, because the mean of its divisors is an integer number (374325).

2⁹⁹⁸¹⁹⁸ is an apocalyptic number.

998198 is a deficient number, since it is larger than the sum of its proper divisors (499102).

998198 is a wasteful number, since it uses less digits than its factorization.

998198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499101.

The product of its digits is 46656, while the sum is 44.

The square root of 998198 is about 999.0985937334. The cubic root of 998198 is about 99.9398972171.

The spelling of 998198 in words is "nine hundred ninety-eight thousand, one hundred ninety-eight".