198978980 has 48 divisors (see below), whose sum is σ = 437754240. Its totient is φ = 75829248.

The previous prime is 198978973. The next prime is 198979009. The reversal of 198978980 is 89879891.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140516 + ... + 141924.

It is an arithmetic number, because the mean of its divisors is an integer number (9119880).

Almost surely, 2^198978980 is an apocalyptic number.

198978980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198978980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218877120).

198978980 is an abundant number, since it is smaller than the sum of its proper divisors (238775260).

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

198978980 is a wasteful number, since it uses less digits than its factorization.

198978980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748 (or 1746 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 59.

The square root of 198978980 is about 14105.9909258442. The cubic root of 198978980 is about 583.8066891621.

The spelling of 198978980 in words is "one hundred ninety-eight million, nine hundred seventy-eight thousand, nine hundred eighty".