198817980 has 48 divisors (see below), whose sum is σ = 580898304. Its totient is φ = 50712640.

The previous prime is 198817967. The next prime is 198817991. The reversal of 198817980 is 89718891.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 70656 + ... + 73415.

It is an arithmetic number, because the mean of its divisors is an integer number (12102048).

Almost surely, 2^198817980 is an apocalyptic number.

198817980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198817980 is an abundant number, since it is smaller than the sum of its proper divisors (382080324).

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

198817980 is a wasteful number, since it uses less digits than its factorization.

198817980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144106 (or 144104 counting only the distinct ones).

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

The square root of 198817980 is about 14100.2829758839. The cubic root of 198817980 is about 583.6491880378.

The spelling of 198817980 in words is "one hundred ninety-eight million, eight hundred seventeen thousand, nine hundred eighty".