865087 has 2 divisors, whose sum is σ = 865088. Its totient is φ = 865086.

The previous prime is 865069. The next prime is 865091. The reversal of 865087 is 780568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 865087 - 2⁷ = 864959 is a prime.

865087 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432543 + 432544.

It is an arithmetic number, because the mean of its divisors is an integer number (432544).

2⁸⁶⁵⁰⁸⁷ is an apocalyptic number.

865087 is a deficient number, since it is larger than the sum of its proper divisors (1).

865087 is an equidigital number, since it uses as much as digits as its factorization.

865087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 865087 is about 930.1005322007. The cubic root of 865087 is about 95.2839886234.

The spelling of 865087 in words is "eight hundred sixty-five thousand, eighty-seven".