199623 has 4 divisors (see below), whose sum is σ = 266168. Its totient is φ = 133080.

The previous prime is 199621. The next prime is 199637. The reversal of 199623 is 326991.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 199623 - 2¹ = 199621 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199621) 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, 33268 + ... + 33273.

It is an arithmetic number, because the mean of its divisors is an integer number (66542).

2¹⁹⁹⁶²³ is an apocalyptic number.

199623 is a deficient number, since it is larger than the sum of its proper divisors (66545).

199623 is an equidigital number, since it uses as much as digits as its factorization.

199623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66544.

The product of its digits is 2916, while the sum is 30.

The square root of 199623 is about 446.7918978675. The cubic root of 199623 is about 58.4435864956.

The spelling of 199623 in words is "one hundred ninety-nine thousand, six hundred twenty-three".