199849 has 4 divisors (see below), whose sum is σ = 215236. Its totient is φ = 184464.

The previous prime is 199831. The next prime is 199853. The reversal of 199849 is 948991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948991 = 17 ⋅55823.

It can be written as a sum of positive squares in 2 ways, for example, as 13225 + 186624 = 115^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 199849 - 2⁷ = 199721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199819) 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, 7674 + ... + 7699.

It is an arithmetic number, because the mean of its divisors is an integer number (53809).

2¹⁹⁹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

199849 is a deficient number, since it is larger than the sum of its proper divisors (15387).

199849 is a wasteful number, since it uses less digits than its factorization.

199849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15386.

The product of its digits is 23328, while the sum is 40.

The square root of 199849 is about 447.0447404903. The cubic root of 199849 is about 58.4656335028.

Subtracting from 199849 its sum of digits (40), we obtain a square (199809 = 447²).

The spelling of 199849 in words is "one hundred ninety-nine thousand, eight hundred forty-nine".