199869 has 8 divisors (see below), whose sum is σ = 282240. Its totient is φ = 125376.

The previous prime is 199853. The next prime is 199873. The reversal of 199869 is 968991.

199869 = 145² + 146² + ... + 153².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199869 - 2⁴ = 199853 is a prime.

It is a super-2 number, since 2×199869² = 79895234322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 199869.

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 7 ways as a sum of consecutive naturals, for example, 1909 + ... + 2010.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2¹⁹⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

199869 is a deficient number, since it is larger than the sum of its proper divisors (82371).

199869 is a wasteful number, since it uses less digits than its factorization.

199869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939.

The product of its digits is 34992, while the sum is 42.

The square root of 199869 is about 447.0671090563. The cubic root of 199869 is about 58.4675837647.

The spelling of 199869 in words is "one hundred ninety-nine thousand, eight hundred sixty-nine".