198655980 has 24 divisors (see below), whose sum is σ = 556236912. Its totient is φ = 52974912.

The previous prime is 198655979. The next prime is 198655987. The reversal of 198655980 is 89556891.

It is not an unprimeable number, because it can be changed into a prime (198655987) 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, 1655407 + ... + 1655526.

It is an arithmetic number, because the mean of its divisors is an integer number (23176538).

Almost surely, 2^198655980 is an apocalyptic number.

198655980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198655980 is an abundant number, since it is smaller than the sum of its proper divisors (357580932).

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

198655980 is a wasteful number, since it uses less digits than its factorization.

198655980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310945 (or 3310943 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 51.

The square root of 198655980 is about 14094.5372396542. The cubic root of 198655980 is about 583.4906228002.

The spelling of 198655980 in words is "one hundred ninety-eight million, six hundred fifty-five thousand, nine hundred eighty".