198917040 has 160 divisors (see below), whose sum is σ = 709954560. Its totient is φ = 45130752.

The previous prime is 198917039. The next prime is 198917057. The reversal of 198917040 is 40719891.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 198917040.

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 31 ways as a sum of consecutive naturals, for example, 280206 + ... + 280914.

It is an arithmetic number, because the mean of its divisors is an integer number (4437216).

Almost surely, 2^198917040 is an apocalyptic number.

198917040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198917040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354977280).

198917040 is an abundant number, since it is smaller than the sum of its proper divisors (511037520).

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

198917040 is a wasteful number, since it uses less digits than its factorization.

198917040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 198917040 is about 14103.7952339078. The cubic root of 198917040 is about 583.7461053102.

The spelling of 198917040 in words is "one hundred ninety-eight million, nine hundred seventeen thousand, forty".