198857992 has 8 divisors (see below), whose sum is σ = 372858750. Its totient is φ = 99428992.

The previous prime is 198857983. The next prime is 198858001. The reversal of 198857992 is 299758891.

It is an interprime number because it is at equal distance from previous prime (198857983) and next prime (198858001).

It can be written as a sum of positive squares in only one way, i.e., 198640836 + 217156 = 14094^2 + 466^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12428617 + ... + 12428632.

Almost surely, 2^198857992 is an apocalyptic number.

It is an amenable number.

198857992 is a deficient number, since it is larger than the sum of its proper divisors (174000758).

198857992 is a wasteful number, since it uses less digits than its factorization.

198857992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24857255 (or 24857251 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 58.

The square root of 198857992 is about 14101.7017412793. The cubic root of 198857992 is about 583.6883384287.

The spelling of 198857992 in words is "one hundred ninety-eight million, eight hundred fifty-seven thousand, nine hundred ninety-two".