198448905940 has 96 divisors (see below), whose sum is σ = 447893349120. Its totient is φ = 73627646976.

The previous prime is 198448905871. The next prime is 198448905947. The reversal of 198448905940 is 49509844891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198448905947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9798064 + ... + 9818296.

It is an arithmetic number, because the mean of its divisors is an integer number (4665555720).

Almost surely, 2^198448905940 is an apocalyptic number.

198448905940 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 198448905940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223946674560).

198448905940 is an abundant number, since it is smaller than the sum of its proper divisors (249444443180).

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

198448905940 is a wasteful number, since it uses less digits than its factorization.

198448905940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20801 (or 20799 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 198448905940 in words is "one hundred ninety-eight billion, four hundred forty-eight million, nine hundred five thousand, nine hundred forty".