209023 has 4 divisors (see below), whose sum is σ = 213928. Its totient is φ = 204120.

The previous prime is 209021. The next prime is 209029. The reversal of 209023 is 320902.

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

It is a cyclic number.

It is not a de Polignac number, because 209023 - 2¹ = 209021 is a prime.

It is a super-2 number, since 2×209023² = 87381229058, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 208988 and 209006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2388 + ... + 2473.

It is an arithmetic number, because the mean of its divisors is an integer number (53482).

2²⁰⁹⁰²³ is an apocalyptic number.

209023 is a deficient number, since it is larger than the sum of its proper divisors (4905).

209023 is an equidigital number, since it uses as much as digits as its factorization.

209023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4904.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 209023 is about 457.1903323562. The cubic root of 209023 is about 59.3468982438.

Adding to 209023 its reverse (320902), we get a palindrome (529925).

The spelling of 209023 in words is "two hundred nine thousand, twenty-three".