198561996 has 48 divisors (see below), whose sum is σ = 515652480. Its totient is φ = 66076560.

The previous prime is 198561991. The next prime is 198562033. The reversal of 198561996 is 699165891.

198561996 is a `hidden beast` number, since 19 + 8 + 5 + 619 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (198561991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86455 + ... + 88721.

It is an arithmetic number, because the mean of its divisors is an integer number (10742760).

Almost surely, 2^198561996 is an apocalyptic number.

It is an amenable number.

198561996 is an abundant number, since it is smaller than the sum of its proper divisors (317090484).

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

198561996 is a wasteful number, since it uses less digits than its factorization.

198561996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091 (or 3083 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 198561996 is about 14091.2027875551. The cubic root of 198561996 is about 583.3985919554.

The spelling of 198561996 in words is "one hundred ninety-eight million, five hundred sixty-one thousand, nine hundred ninety-six".