198491908 has 6 divisors (see below), whose sum is σ = 347360846. Its totient is φ = 99245952.

The previous prime is 198491903. The next prime is 198491941. The reversal of 198491908 is 809194891.

It can be written as a sum of positive squares in only one way, i.e., 198471744 + 20164 = 14088^2 + 142^2 .

It is not an unprimeable number, because it can be changed into a prime (198491903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24811485 + ... + 24811492.

Almost surely, 2^198491908 is an apocalyptic number.

It is an amenable number.

198491908 is a deficient number, since it is larger than the sum of its proper divisors (148868938).

198491908 is a wasteful number, since it uses less digits than its factorization.

198491908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49622981 (or 49622979 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 198491908 is about 14088.7156263444. The cubic root of 198491908 is about 583.3299416039.

The spelling of 198491908 in words is "one hundred ninety-eight million, four hundred ninety-one thousand, nine hundred eight".