998866198 has 32 divisors (see below), whose sum is σ = 1714763520. Its totient is φ = 432180000.

The previous prime is 998866177. The next prime is 998866199. The reversal of 998866198 is 891668899.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998866199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34273 + ... + 56323.

It is an arithmetic number, because the mean of its divisors is an integer number (53586360).

Almost surely, 2^998866198 is an apocalyptic number.

998866198 is the 16894-th centered heptagonal number.

998866198 is a deficient number, since it is larger than the sum of its proper divisors (715897322).

998866198 is a wasteful number, since it uses less digits than its factorization.

998866198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22164.

The product of its digits is 13436928, while the sum is 64.

The square root of 998866198 is about 31604.8445337103. The cubic root of 998866198 is about 999.6219230759.

The spelling of 998866198 in words is "nine hundred ninety-eight million, eight hundred sixty-six thousand, one hundred ninety-eight".