198459840 has 112 divisors (see below), whose sum is σ = 640628640. Its totient is φ = 52039680.

The previous prime is 198459809. The next prime is 198459851. The reversal of 198459840 is 48954891.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 198459840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56866 + ... + 60254.

Almost surely, 2^198459840 is an apocalyptic number.

198459840 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 198459840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320314320).

198459840 is an abundant number, since it is smaller than the sum of its proper divisors (442168800).

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

198459840 is a wasteful number, since it uses less digits than its factorization.

198459840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470 (or 3460 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 198459840 is about 14087.5775064416. The cubic root of 198459840 is about 583.2985259957.

The spelling of 198459840 in words is "one hundred ninety-eight million, four hundred fifty-nine thousand, eight hundred forty".