870889 has 2 divisors, whose sum is σ = 870890. Its totient is φ = 870888.

The previous prime is 870871. The next prime is 870901. The reversal of 870889 is 988078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 870489 + 400 = 933^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 870889 - 2¹¹ = 868841 is a prime.

It is not a weakly prime, because it can be changed into another prime (870809) 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 as a sum of consecutive naturals, namely, 435444 + 435445.

It is an arithmetic number, because the mean of its divisors is an integer number (435445).

2⁸⁷⁰⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

870889 is a deficient number, since it is larger than the sum of its proper divisors (1).

870889 is an equidigital number, since it uses as much as digits as its factorization.

870889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 870889 is about 933.2143376524. The cubic root of 870889 is about 95.4965323156.

The spelling of 870889 in words is "eight hundred seventy thousand, eight hundred eighty-nine".