198019 has 4 divisors (see below), whose sum is σ = 200880. Its totient is φ = 195160.

The previous prime is 198017. The next prime is 198031. The reversal of 198019 is 910891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910891 = 107 ⋅8513.

It is a cyclic number.

It is not a de Polignac number, because 198019 - 2¹ = 198017 is a prime.

It is a super-2 number, since 2×198019² = 78423048722, which contains 22 as substring.

It is a Duffinian number.

198019 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (198013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1324 + ... + 1465.

It is an arithmetic number, because the mean of its divisors is an integer number (50220).

2¹⁹⁸⁰¹⁹ is an apocalyptic number.

198019 is a deficient number, since it is larger than the sum of its proper divisors (2861).

198019 is an equidigital number, since it uses as much as digits as its factorization.

198019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 198019 is about 444.9932583759. The cubic root of 198019 is about 58.2866311004.

The spelling of 198019 in words is "one hundred ninety-eight thousand, nineteen".