198543 has 12 divisors (see below), whose sum is σ = 282440. Its totient is φ = 124032.

The previous prime is 198533. The next prime is 198553. The reversal of 198543 is 345891.

It is an interprime number because it is at equal distance from previous prime (198533) and next prime (198553).

It is not a de Polignac number, because 198543 - 2⁶ = 198479 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 198543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 753 + ... + 981.

2¹⁹⁸⁵⁴³ is an apocalyptic number.

198543 is a deficient number, since it is larger than the sum of its proper divisors (83897).

198543 is a wasteful number, since it uses less digits than its factorization.

198543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 249 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 198543 is about 445.5816423508. The cubic root of 198543 is about 58.3379987198.

It can be divided in two parts, 198 and 543, that added together give a triangular number (741 = T₃₈).

The spelling of 198543 in words is "one hundred ninety-eight thousand, five hundred forty-three".