198066440 has 128 divisors (see below), whose sum is σ = 540933120. Its totient is φ = 64281600.

The previous prime is 198066437. The next prime is 198066461. The reversal of 198066440 is 44660891.

It is a junction number, because it is equal to n+sod(n) for n = 198066394 and 198066403.

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 31 ways as a sum of consecutive naturals, for example, 176762 + ... + 177878.

It is an arithmetic number, because the mean of its divisors is an integer number (4226040).

Almost surely, 2^198066440 is an apocalyptic number.

198066440 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 198066440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270466560).

198066440 is an abundant number, since it is smaller than the sum of its proper divisors (342866680).

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

198066440 is a wasteful number, since it uses less digits than its factorization.

198066440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 198066440 is about 14073.6079240542. The cubic root of 198066440 is about 582.9128536256.

The spelling of 198066440 in words is "one hundred ninety-eight million, sixty-six thousand, four hundred forty".