209423 has 8 divisors (see below), whose sum is σ = 225792. Its totient is φ = 193536.

The previous prime is 209401. The next prime is 209431. The reversal of 209423 is 324902.

209423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 209423 - 2⁶ = 209359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209395 and 209404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209123) 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, 1586 + ... + 1712.

It is an arithmetic number, because the mean of its divisors is an integer number (28224).

2²⁰⁹⁴²³ is an apocalyptic number.

209423 is a deficient number, since it is larger than the sum of its proper divisors (16369).

209423 is a wasteful number, since it uses less digits than its factorization.

209423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 209423 is about 457.6275778403. The cubic root of 209423 is about 59.3847308151.

It can be divided in two parts, 20942 and 3, that multiplied together give a palindrome (62826).

The spelling of 209423 in words is "two hundred nine thousand, four hundred twenty-three".