199847 has 4 divisors (see below), whose sum is σ = 208560. Its totient is φ = 191136.

The previous prime is 199831. The next prime is 199853. The reversal of 199847 is 748991.

199847 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 199847 - 2⁴ = 199831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199807) 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, 4322 + ... + 4367.

It is an arithmetic number, because the mean of its divisors is an integer number (52140).

2¹⁹⁹⁸⁴⁷ is an apocalyptic number.

199847 is a deficient number, since it is larger than the sum of its proper divisors (8713).

199847 is an equidigital number, since it uses as much as digits as its factorization.

199847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8712.

The product of its digits is 18144, while the sum is 38.

The square root of 199847 is about 447.0425035721. The cubic root of 199847 is about 58.4654384695.

Subtracting from 199847 its sum of digits (38), we obtain a square (199809 = 447²).

It can be divided in two parts, 19984 and 7, that added together give a palindrome (19991).

The spelling of 199847 in words is "one hundred ninety-nine thousand, eight hundred forty-seven".