198708401040 has 160 divisors (see below), whose sum is σ = 629768977920. Its totient is φ = 51806533632.

The previous prime is 198708401039. The next prime is 198708401053. The reversal of 198708401040 is 40104807891.

It is a junction number, because it is equal to n+sod(n) for n = 198708400983 and 198708401001.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11237326 + ... + 11254994.

It is an arithmetic number, because the mean of its divisors is an integer number (3936056112).

Almost surely, 2^198708401040 is an apocalyptic number.

198708401040 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 198708401040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314884488960).

198708401040 is an abundant number, since it is smaller than the sum of its proper divisors (431060576880).

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

198708401040 is a wasteful number, since it uses less digits than its factorization.

198708401040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18729 (or 18723 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 198708401040 in words is "one hundred ninety-eight billion, seven hundred eight million, four hundred one thousand, forty".