198860009040 has 400 divisors, whose sum is σ = 861097564800. Its totient is φ = 41321456640.

The previous prime is 198860009021. The next prime is 198860009041. The reversal of 198860009040 is 40900068891.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198860009041) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 299686 + ... + 698234.

It is an arithmetic number, because the mean of its divisors is an integer number (2152743912).

Almost surely, 2^198860009040 is an apocalyptic number.

198860009040 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 198860009040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (430548782400).

198860009040 is an abundant number, since it is smaller than the sum of its proper divisors (662237555760).

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

198860009040 is a wasteful number, since it uses less digits than its factorization.

198860009040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398592 (or 398577 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 198860009040 in words is "one hundred ninety-eight billion, eight hundred sixty million, nine thousand, forty".