209087 has 4 divisors (see below), whose sum is σ = 214776. Its totient is φ = 203400.

The previous prime is 209071. The next prime is 209089. The reversal of 209087 is 780902.

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 209087 - 2⁴ = 209071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 209087.

It is not an unprimeable number, because it can be changed into a prime (209089) 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, 2789 + ... + 2862.

It is an arithmetic number, because the mean of its divisors is an integer number (53694).

2²⁰⁹⁰⁸⁷ is an apocalyptic number.

209087 is a deficient number, since it is larger than the sum of its proper divisors (5689).

209087 is an equidigital number, since it uses as much as digits as its factorization.

209087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 209087 is about 457.2603197305. The cubic root of 209087 is about 59.3529546967.

Adding to 209087 its reverse (780902), we get a palindrome (989989).

The spelling of 209087 in words is "two hundred nine thousand, eighty-seven".