198019797 has 8 divisors (see below), whose sum is σ = 266105856. Its totient is φ = 130973472.

The previous prime is 198019793. The next prime is 198019799. The reversal of 198019797 is 797910891.

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

It is not a de Polignac number, because 198019797 - 2² = 198019793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198019793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259488 + ... + 260249.

It is an arithmetic number, because the mean of its divisors is an integer number (33263232).

Almost surely, 2^198019797 is an apocalyptic number.

It is an amenable number.

198019797 is a deficient number, since it is larger than the sum of its proper divisors (68086059).

198019797 is a wasteful number, since it uses less digits than its factorization.

198019797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519867.

The product of its (nonzero) digits is 285768, while the sum is 51.

The square root of 198019797 is about 14071.9507176511. The cubic root of 198019797 is about 582.8670929897.

The spelling of 198019797 in words is "one hundred ninety-eight million, nineteen thousand, seven hundred ninety-seven".