855787 has 2 divisors, whose sum is σ = 855788. Its totient is φ = 855786.

The previous prime is 855781. The next prime is 855821. The reversal of 855787 is 787558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855787 - 2¹¹ = 853739 is a prime.

It is not a weakly prime, because it can be changed into another prime (855781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427893 + 427894.

It is an arithmetic number, because the mean of its divisors is an integer number (427894).

2⁸⁵⁵⁷⁸⁷ is an apocalyptic number.

855787 is a deficient number, since it is larger than the sum of its proper divisors (1).

855787 is an equidigital number, since it uses as much as digits as its factorization.

855787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78400, while the sum is 40.

The square root of 855787 is about 925.0875634231. The cubic root of 855787 is about 94.9413118588.

The spelling of 855787 in words is "eight hundred fifty-five thousand, seven hundred eighty-seven".