199923 has 8 divisors (see below), whose sum is σ = 269568. Its totient is φ = 131784.

The previous prime is 199921. The next prime is 199931. The reversal of 199923 is 329991.

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

It is not a de Polignac number, because 199923 - 2¹ = 199921 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (199921) 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, 15 + ... + 632.

It is an arithmetic number, because the mean of its divisors is an integer number (33696).

2¹⁹⁹⁹²³ is an apocalyptic number.

199923 is a deficient number, since it is larger than the sum of its proper divisors (69645).

199923 is a wasteful number, since it uses less digits than its factorization.

199923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753.

The product of its digits is 4374, while the sum is 33.

The square root of 199923 is about 447.1274985952. The cubic root of 199923 is about 58.4728488221.

The spelling of 199923 in words is "one hundred ninety-nine thousand, nine hundred twenty-three".