198744840 has 384 divisors, whose sum is σ = 805109760. Its totient is φ = 43110144.

The previous prime is 198744827. The next prime is 198744869. The reversal of 198744840 is 48447891.

198744840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×198744840² = 78999022853251200, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1564857 + ... + 1564983.

It is an arithmetic number, because the mean of its divisors is an integer number (2096640).

Almost surely, 2^198744840 is an apocalyptic number.

198744840 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 198744840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402554880).

198744840 is an abundant number, since it is smaller than the sum of its proper divisors (606364920).

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

198744840 is a wasteful number, since it uses less digits than its factorization.

198744840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 167 counting only the distinct ones).

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

The square root of 198744840 is about 14097.6891723431. The cubic root of 198744840 is about 583.5776094389.

The spelling of 198744840 in words is "one hundred ninety-eight million, seven hundred forty-four thousand, eight hundred forty".