199879 has 4 divisors (see below), whose sum is σ = 201960. Its totient is φ = 197800.

The previous prime is 199877. The next prime is 199889. The reversal of 199879 is 978991.

199879 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, and also an emirpimes, since its reverse is a distinct semiprime: 978991 = 13 ⋅75307.

It is a cyclic number.

It is not a de Polignac number, because 199879 - 2¹ = 199877 is a prime.

It is a super-2 number, since 2×199879² = 79903229282, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199873) 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, 889 + ... + 1090.

It is an arithmetic number, because the mean of its divisors is an integer number (50490).

2¹⁹⁹⁸⁷⁹ is an apocalyptic number.

199879 is a deficient number, since it is larger than the sum of its proper divisors (2081).

199879 is a wasteful number, since it uses less digits than its factorization.

199879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080.

The product of its digits is 40824, while the sum is 43.

The square root of 199879 is about 447.0782929197. The cubic root of 199879 is about 58.4685588469.

The spelling of 199879 in words is "one hundred ninety-nine thousand, eight hundred seventy-nine".