198719840 has 48 divisors (see below), whose sum is σ = 512159760. Its totient is φ = 72261120.

The previous prime is 198719837. The next prime is 198719849. The reversal of 198719840 is 48917891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198719849) 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, 54695 + ... + 58214.

It is an arithmetic number, because the mean of its divisors is an integer number (10669995).

Almost surely, 2^198719840 is an apocalyptic number.

198719840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198719840 is an abundant number, since it is smaller than the sum of its proper divisors (313439920).

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

198719840 is a wasteful number, since it uses less digits than its factorization.

198719840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112935 (or 112927 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 198719840 is about 14096.8024743202. The cubic root of 198719840 is about 583.5531391147.

The spelling of 198719840 in words is "one hundred ninety-eight million, seven hundred nineteen thousand, eight hundred forty".