873209 has 2 divisors, whose sum is σ = 873210. Its totient is φ = 873208.

The previous prime is 873157. The next prime is 873247. The reversal of 873209 is 902378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765625 + 107584 = 875^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 873209 - 2⁸ = 872953 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 873209.

It is not a weakly prime, because it can be changed into another prime (873109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436604 + 436605.

It is an arithmetic number, because the mean of its divisors is an integer number (436605).

2⁸⁷³²⁰⁹ is an apocalyptic number.

It is an amenable number.

873209 is a deficient number, since it is larger than the sum of its proper divisors (1).

873209 is an equidigital number, since it uses as much as digits as its factorization.

873209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 873209 is about 934.4565265436. The cubic root of 873209 is about 95.5812562822.

The spelling of 873209 in words is "eight hundred seventy-three thousand, two hundred nine".