198921960 has 64 divisors (see below), whose sum is σ = 663076800. Its totient is φ = 53045568.

The previous prime is 198921959. The next prime is 198921971. The reversal of 198921960 is 69129891.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 91014 + ... + 93173.

It is an arithmetic number, because the mean of its divisors is an integer number (10360575).

Almost surely, 2^198921960 is an apocalyptic number.

198921960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198921960 is an abundant number, since it is smaller than the sum of its proper divisors (464154840).

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

198921960 is a wasteful number, since it uses less digits than its factorization.

198921960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184207 (or 184197 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 198921960 is about 14103.9696539662. The cubic root of 198921960 is about 583.7509180488.

The spelling of 198921960 in words is "one hundred ninety-eight million, nine hundred twenty-one thousand, nine hundred sixty".