198100840 has 128 divisors (see below), whose sum is σ = 559872000. Its totient is φ = 61509888.

The previous prime is 198100829. The next prime is 198100853. The reversal of 198100840 is 48001891.

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, 121551 + ... + 123169.

It is an arithmetic number, because the mean of its divisors is an integer number (4374000).

Almost surely, 2^198100840 is an apocalyptic number.

198100840 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 198100840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279936000).

198100840 is an abundant number, since it is smaller than the sum of its proper divisors (361771160).

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

198100840 is a wasteful number, since it uses less digits than its factorization.

198100840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1675 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 198100840 is about 14074.8300167355. The cubic root of 198100840 is about 582.9465982644.

The spelling of 198100840 in words is "one hundred ninety-eight million, one hundred thousand, eight hundred forty".