209073 has 4 divisors (see below), whose sum is σ = 278768. Its totient is φ = 139380.

The previous prime is 209071. The next prime is 209089. The reversal of 209073 is 370902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 209073 - 2¹ = 209071 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209071) 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, 34843 + ... + 34848.

It is an arithmetic number, because the mean of its divisors is an integer number (69692).

2²⁰⁹⁰⁷³ is an apocalyptic number.

It is an amenable number.

209073 is a deficient number, since it is larger than the sum of its proper divisors (69695).

209073 is an equidigital number, since it uses as much as digits as its factorization.

209073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69694.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 209073 is about 457.2450109077. The cubic root of 209073 is about 59.3516299532.

Adding to 209073 its reverse (370902), we get a palindrome (579975).

It can be divided in two parts, 20907 and 3, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 209073 in words is "two hundred nine thousand, seventy-three".