198420197 has 6 divisors (see below), whose sum is σ = 203379474. Its totient is φ = 193579040.

The previous prime is 198420179. The next prime is 198420199. The reversal of 198420197 is 791024891.

It can be written as a sum of positive squares in 3 ways, for example, as 9247681 + 189172516 = 3041^2 + 13754^2 .

It is not a de Polignac number, because 198420197 - 2⁶ = 198420133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198420199) 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 5 ways as a sum of consecutive naturals, for example, 57338 + ... + 60699.

It is an arithmetic number, because the mean of its divisors is an integer number (33896579).

Almost surely, 2^198420197 is an apocalyptic number.

It is an amenable number.

198420197 is a deficient number, since it is larger than the sum of its proper divisors (4959277).

198420197 is an equidigital number, since it uses as much as digits as its factorization.

198420197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118119 (or 118078 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 198420197 is about 14086.1704164049. The cubic root of 198420197 is about 583.2596848153.

The spelling of 198420197 in words is "one hundred ninety-eight million, four hundred twenty thousand, one hundred ninety-seven".