198785840 has 80 divisors (see below), whose sum is σ = 506351520. Its totient is φ = 71976960.

The previous prime is 198785837. The next prime is 198785869. The reversal of 198785840 is 48587891.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349076 + ... + 349644.

It is an arithmetic number, because the mean of its divisors is an integer number (6329394).

Almost surely, 2^198785840 is an apocalyptic number.

198785840 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 198785840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253175760).

198785840 is an abundant number, since it is smaller than the sum of its proper divisors (307565680).

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

198785840 is a wasteful number, since it uses less digits than its factorization.

198785840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 198785840 is about 14099.1432363814. The cubic root of 198785840 is about 583.6177363287.

The spelling of 198785840 in words is "one hundred ninety-eight million, seven hundred eighty-five thousand, eight hundred forty".