873989 has 2 divisors, whose sum is σ = 873990. Its totient is φ = 873988.

The previous prime is 873979. The next prime is 873991. The reversal of 873989 is 989378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 209764 = 815^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 873989 - 2¹² = 869893 is a prime.

It is a Sophie Germain prime.

Together with 873991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon 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 873989.

It is not a weakly prime, because it can be changed into another prime (873959) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436994 + 436995.

It is an arithmetic number, because the mean of its divisors is an integer number (436995).

2⁸⁷³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

873989 is a deficient number, since it is larger than the sum of its proper divisors (1).

873989 is an equidigital number, since it uses as much as digits as its factorization.

873989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 873989 is about 934.8737882730. The cubic root of 873989 is about 95.6097073527.

The spelling of 873989 in words is "eight hundred seventy-three thousand, nine hundred eighty-nine".