869855 has 16 divisors (see below), whose sum is σ = 1235520. Its totient is φ = 575232.

The previous prime is 869849. The next prime is 869863. The reversal of 869855 is 558968.

It is not a de Polignac number, because 869855 - 2⁸ = 869599 is a 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 869855.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 587 + ... + 1443.

It is an arithmetic number, because the mean of its divisors is an integer number (77220).

2⁸⁶⁹⁸⁵⁵ is an apocalyptic number.

869855 is a deficient number, since it is larger than the sum of its proper divisors (365665).

869855 is a wasteful number, since it uses less digits than its factorization.

869855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898.

The product of its digits is 86400, while the sum is 41.

The square root of 869855 is about 932.6601739112. The cubic root of 869855 is about 95.4587232419.

The spelling of 869855 in words is "eight hundred sixty-nine thousand, eight hundred fifty-five".