198784 has 16 divisors (see below), whose sum is σ = 396270. Its totient is φ = 99328.

The previous prime is 198769. The next prime is 198811. The reversal of 198784 is 487891.

198784 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in only one way, i.e., 193600 + 5184 = 440^2 + 72^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

198784 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 as a sum of consecutive naturals, namely, 649 + ... + 904.

2¹⁹⁸⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

198784 is a deficient number, since it is larger than the sum of its proper divisors (197486).

198784 is an equidigital number, since it uses as much as digits as its factorization.

198784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567 (or 1555 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 198784 is about 445.8519933790. The cubic root of 198784 is about 58.3615935630.

The spelling of 198784 in words is "one hundred ninety-eight thousand, seven hundred eighty-four".