198589840 has 40 divisors (see below), whose sum is σ = 468237888. Its totient is φ = 78314880.

The previous prime is 198589829. The next prime is 198589847. The reversal of 198589840 is 48985891.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (198589847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11802 + ... + 23161.

Almost surely, 2^198589840 is an apocalyptic number.

198589840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198589840 is an abundant number, since it is smaller than the sum of its proper divisors (269648048).

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

198589840 is a wasteful number, since it uses less digits than its factorization.

198589840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35047 (or 35041 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 52.

The square root of 198589840 is about 14092.1907452319. The cubic root of 198589840 is about 583.4258603341.

The spelling of 198589840 in words is "one hundred ninety-eight million, five hundred eighty-nine thousand, eight hundred forty".