198538 has 8 divisors (see below), whose sum is σ = 303588. Its totient is φ = 97344.

The previous prime is 198533. The next prime is 198553. The reversal of 198538 is 835891.

It can be written as a sum of positive squares in 2 ways, for example, as 190969 + 7569 = 437^2 + 87^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (198533) by changing a digit.

198538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831 + ... + 1042.

2¹⁹⁸⁵³⁸ is an apocalyptic number.

198538 is a deficient number, since it is larger than the sum of its proper divisors (105050).

198538 is a wasteful number, since it uses less digits than its factorization.

198538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928.

The product of its digits is 8640, while the sum is 34.

The square root of 198538 is about 445.5760316714. The cubic root of 198538 is about 58.3375089981.

The spelling of 198538 in words is "one hundred ninety-eight thousand, five hundred thirty-eight".