198007840 has 48 divisors (see below), whose sum is σ = 495317592. Its totient is φ = 74543104.

The previous prime is 198007837. The next prime is 198007867. The reversal of 198007840 is 48700891.

It can be written as a sum of positive squares in 4 ways, for example, as 184199184 + 13808656 = 13572^2 + 3716^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 198007840.

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 7 ways as a sum of consecutive naturals, for example, 33679 + ... + 39118.

Almost surely, 2^198007840 is an apocalyptic number.

198007840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198007840 is an abundant number, since it is smaller than the sum of its proper divisors (297309752).

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

198007840 is a wasteful number, since it uses less digits than its factorization.

198007840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72829 (or 72821 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 198007840 is about 14071.5258589820. The cubic root of 198007840 is about 582.8553610279.

The spelling of 198007840 in words is "one hundred ninety-eight million, seven thousand, eight hundred forty".