197808198 has 24 divisors (see below), whose sum is σ = 460207512. Its totient is φ = 56516544.

The previous prime is 197808167. The next prime is 197808223. The reversal of 197808198 is 891808791.

It is a self number, because there is not a number n which added to its sum of digits gives 197808198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 336115 + ... + 336702.

It is an arithmetic number, because the mean of its divisors is an integer number (19175313).

Almost surely, 2^197808198 is an apocalyptic number.

197808198 is an abundant number, since it is smaller than the sum of its proper divisors (262399314).

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

197808198 is a wasteful number, since it uses less digits than its factorization.

197808198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672836 (or 672829 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 51.

The square root of 197808198 is about 14064.4302408594. The cubic root of 197808198 is about 582.6594065992.

The spelling of 197808198 in words is "one hundred ninety-seven million, eight hundred eight thousand, one hundred ninety-eight".