198921966 has 16 divisors (see below), whose sum is σ = 398037888. Its totient is φ = 66275000.

The previous prime is 198921959. The next prime is 198921971. The reversal of 198921966 is 669129891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7591 + ... + 21341.

It is an arithmetic number, because the mean of its divisors is an integer number (24877368).

Almost surely, 2^198921966 is an apocalyptic number.

198921966 is an abundant number, since it is smaller than the sum of its proper divisors (199115922).

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

198921966 is a wasteful number, since it uses less digits than its factorization.

198921966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16167.

The product of its digits is 419904, while the sum is 51.

The square root of 198921966 is about 14103.9698666723. The cubic root of 198921966 is about 583.7509239180.

The spelling of 198921966 in words is "one hundred ninety-eight million, nine hundred twenty-one thousand, nine hundred sixty-six".