198059823 has 28 divisors (see below), whose sum is σ = 319811800. Its totient is φ = 121877136.

The previous prime is 198059801. The next prime is 198059861. The reversal of 198059823 is 328950891.

It is a happy number.

It is not a de Polignac number, because 198059823 - 2⁵ = 198059791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198059893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 973 + ... + 19926.

It is an arithmetic number, because the mean of its divisors is an integer number (11421850).

Almost surely, 2^198059823 is an apocalyptic number.

198059823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

198059823 is a deficient number, since it is larger than the sum of its proper divisors (121751977).

198059823 is an equidigital number, since it uses as much as digits as its factorization.

198059823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20930 (or 20915 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 198059823 is about 14073.3728366728. The cubic root of 198059823 is about 582.9063622394.

The spelling of 198059823 in words is "one hundred ninety-eight million, fifty-nine thousand, eight hundred twenty-three".