198145798 has 8 divisors (see below), whose sum is σ = 301290408. Its totient is φ = 97715664.

The previous prime is 198145789. The next prime is 198145799. The reversal of 198145798 is 897541891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×198145798³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198145799) 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 3 ways as a sum of consecutive naturals, for example, 678436 + ... + 678727.

It is an arithmetic number, because the mean of its divisors is an integer number (37661301).

Almost surely, 2^198145798 is an apocalyptic number.

198145798 is a deficient number, since it is larger than the sum of its proper divisors (103144610).

198145798 is a wasteful number, since it uses less digits than its factorization.

198145798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357238.

The product of its digits is 725760, while the sum is 52.

The square root of 198145798 is about 14076.4270324539. The cubic root of 198145798 is about 582.9906938721.

The spelling of 198145798 in words is "one hundred ninety-eight million, one hundred forty-five thousand, seven hundred ninety-eight".