199843 has 4 divisors (see below), whose sum is σ = 228400. Its totient is φ = 171288.

The previous prime is 199831. The next prime is 199853. The reversal of 199843 is 348991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199843 - 2⁵ = 199811 is a prime.

It is a Duffinian number.

199843 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 199799 and 199808.

It is not an unprimeable number, because it can be changed into a prime (199813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14268 + ... + 14281.

It is an arithmetic number, because the mean of its divisors is an integer number (57100).

2¹⁹⁹⁸⁴³ is an apocalyptic number.

199843 is a deficient number, since it is larger than the sum of its proper divisors (28557).

199843 is an equidigital number, since it uses as much as digits as its factorization.

199843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28556.

The product of its digits is 7776, while the sum is 34.

The square root of 199843 is about 447.0380297022. The cubic root of 199843 is about 58.4650483989.

Subtracting from 199843 its sum of digits (34), we obtain a square (199809 = 447²).

The spelling of 199843 in words is "one hundred ninety-nine thousand, eight hundred forty-three".