855889 has 2 divisors, whose sum is σ = 855890. Its totient is φ = 855888.

The previous prime is 855887. The next prime is 855901. The reversal of 855889 is 988558.

855889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 36864 = 905^2 + 192^2 .

It is a cyclic number.

It is not a de Polignac number, because 855889 - 2¹ = 855887 is a prime.

Together with 855887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (855887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427944 + 427945.

It is an arithmetic number, because the mean of its divisors is an integer number (427945).

2⁸⁵⁵⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

855889 is a deficient number, since it is larger than the sum of its proper divisors (1).

855889 is an equidigital number, since it uses as much as digits as its factorization.

855889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 43.

The square root of 855889 is about 925.1426916968. The cubic root of 855889 is about 94.9450836810.

The spelling of 855889 in words is "eight hundred fifty-five thousand, eight hundred eighty-nine".