199904 has 12 divisors (see below), whose sum is σ = 393624. Its totient is φ = 99936.

The previous prime is 199889. The next prime is 199909. The reversal of 199904 is 409991.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 6247 = 199904 / (1 + 9 + 9 + 9 + 0 + 4).

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 (199909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3092 + ... + 3155.

It is an arithmetic number, because the mean of its divisors is an integer number (32802).

2¹⁹⁹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

199904 is a deficient number, since it is larger than the sum of its proper divisors (193720).

199904 is an equidigital number, since it uses as much as digits as its factorization.

199904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6257 (or 6249 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 199904 is about 447.1062513542. The cubic root of 199904 is about 58.4709964100.

The spelling of 199904 in words is "one hundred ninety-nine thousand, nine hundred four".