198447840 has 192 divisors, whose sum is σ = 705438720. Its totient is φ = 52093440.

The previous prime is 198447829. The next prime is 198447853. The reversal of 198447840 is 48744891.

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

It is a congruent number.

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, 306397 + ... + 307043.

It is an arithmetic number, because the mean of its divisors is an integer number (3674160).

Almost surely, 2^198447840 is an apocalyptic number.

198447840 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 198447840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352719360).

198447840 is an abundant number, since it is smaller than the sum of its proper divisors (506990880).

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

198447840 is a wasteful number, since it uses less digits than its factorization.

198447840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 198447840 is about 14087.1515928523. The cubic root of 198447840 is about 583.2867692537.

The spelling of 198447840 in words is "one hundred ninety-eight million, four hundred forty-seven thousand, eight hundred forty".