198978944 has 32 divisors (see below), whose sum is σ = 417271800. Its totient is φ = 94252032.

The previous prime is 198978943. The next prime is 198978953. The reversal of 198978944 is 449879891.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198978943) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 38477 + ... + 43340.

Almost surely, 2^198978944 is an apocalyptic number.

It is an amenable number.

198978944 is an abundant number, since it is smaller than the sum of its proper divisors (218292856).

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

198978944 is an equidigital number, since it uses as much as digits as its factorization.

198978944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81850 (or 81838 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 59.

The square root of 198978944 is about 14105.9896497906. The cubic root of 198978944 is about 583.8066539539.

The spelling of 198978944 in words is "one hundred ninety-eight million, nine hundred seventy-eight thousand, nine hundred forty-four".