855887 has 2 divisors, whose sum is σ = 855888. Its totient is φ = 855886.

The previous prime is 855863. The next prime is 855889. The reversal of 855887 is 788558.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855887 - 2¹⁶ = 790351 is a prime.

Together with 855889, it forms a pair of twin primes.

It is a Chen prime.

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 855887.

It is not a weakly prime, because it can be changed into another prime (855889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427943 + 427944.

It is an arithmetic number, because the mean of its divisors is an integer number (427944).

2⁸⁵⁵⁸⁸⁷ is an apocalyptic number.

855887 is a deficient number, since it is larger than the sum of its proper divisors (1).

855887 is an equidigital number, since it uses as much as digits as its factorization.

855887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89600, while the sum is 41.

The square root of 855887 is about 925.1416107818. The cubic root of 855887 is about 94.9450097265.

The spelling of 855887 in words is "eight hundred fifty-five thousand, eight hundred eighty-seven".