198619 has 4 divisors (see below), whose sum is σ = 201096. Its totient is φ = 196144.

The previous prime is 198613. The next prime is 198623. The reversal of 198619 is 916891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 916891 = 61 ⋅15031.

It is a cyclic number.

It is not a de Polignac number, because 198619 - 2⁷ = 198491 is a prime.

It is a super-2 number, since 2×198619² = 78899014322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114 + ... + 1279.

It is an arithmetic number, because the mean of its divisors is an integer number (50274).

2¹⁹⁸⁶¹⁹ is an apocalyptic number.

198619 is a deficient number, since it is larger than the sum of its proper divisors (2477).

198619 is an equidigital number, since it uses as much as digits as its factorization.

198619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476.

The product of its digits is 3888, while the sum is 34.

The square root of 198619 is about 445.6669159810. Note that the first 3 decimals coincide. The cubic root of 198619 is about 58.3454414775.

The spelling of 198619 in words is "one hundred ninety-eight thousand, six hundred nineteen".