198145 has 8 divisors (see below), whose sum is σ = 248256. Its totient is φ = 151536.

The previous prime is 198139. The next prime is 198173. The reversal of 198145 is 541891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 198145 - 2⁷ = 198017 is a prime.

It is a super-3 number, since 3×198145³ = 23338374695695875, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747 + ... + 976.

It is an arithmetic number, because the mean of its divisors is an integer number (31032).

It is a Proth number, since it is equal to 387 ⋅ 2⁹ + 1 and 387 < 2⁹.

2¹⁹⁸¹⁴⁵ is an apocalyptic number.

It is an amenable number.

198145 is a deficient number, since it is larger than the sum of its proper divisors (50111).

198145 is a wasteful number, since it uses less digits than its factorization.

198145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751.

The product of its digits is 1440, while the sum is 28.

The square root of 198145 is about 445.1348110404. The cubic root of 198145 is about 58.2989911238.

It can be divided in two parts, 198 and 145, that added together give a palindrome (343).

The spelling of 198145 in words is "one hundred ninety-eight thousand, one hundred forty-five".