198578 has 4 divisors (see below), whose sum is σ = 297870. Its totient is φ = 99288.

The previous prime is 198571. The next prime is 198589. The reversal of 198578 is 875891.

198578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 104329 + 94249 = 323^2 + 307^2 .

It is not an unprimeable number, because it can be changed into a prime (198571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49643 + ... + 49646.

2¹⁹⁸⁵⁷⁸ is an apocalyptic number.

198578 is a deficient number, since it is larger than the sum of its proper divisors (99292).

198578 is an equidigital number, since it uses as much as digits as its factorization.

198578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99291.

The product of its digits is 20160, while the sum is 38.

The square root of 198578 is about 445.6209151285. The cubic root of 198578 is about 58.3414265415.

The spelling of 198578 in words is "one hundred ninety-eight thousand, five hundred seventy-eight".