198154998 has 20 divisors (see below), whose sum is σ = 444014340. Its totient is φ = 66051612.

The previous prime is 198154993. The next prime is 198155033. The reversal of 198154998 is 899451891.

198154998 is a `hidden beast` number, since 1 + 9 + 8 + 1 + 549 + 98 = 666.

198154998 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198154991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 611428 + ... + 611751.

It is an arithmetic number, because the mean of its divisors is an integer number (22200717).

Almost surely, 2^198154998 is an apocalyptic number.

198154998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

198154998 is an abundant number, since it is smaller than the sum of its proper divisors (245859342).

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

198154998 is a wasteful number, since it uses less digits than its factorization.

198154998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223193 (or 1223184 counting only the distinct ones).

The product of its digits is 933120, while the sum is 54.

The square root of 198154998 is about 14076.7538161325. The cubic root of 198154998 is about 582.9997165740. Note that the first 3 decimals are identical.

The spelling of 198154998 in words is "one hundred ninety-eight million, one hundred fifty-four thousand, nine hundred ninety-eight".