198090240 has 80 divisors (see below), whose sum is σ = 633294288. Its totient is φ = 52822016.

The previous prime is 198090187. The next prime is 198090247. The reversal of 198090240 is 42090891.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198090247) by changing a digit.

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, 5217 + ... + 20576.

Almost surely, 2^198090240 is an apocalyptic number.

198090240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198090240 is an abundant number, since it is smaller than the sum of its proper divisors (435204048).

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

198090240 is an equidigital number, since it uses as much as digits as its factorization.

198090240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25819 (or 25803 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 198090240 is about 14074.4534529764. The cubic root of 198090240 is about 582.9362006235.

The spelling of 198090240 in words is "one hundred ninety-eight million, ninety thousand, two hundred forty".