855 has 12 divisors (see below), whose sum is σ = 1560. Its totient is φ = 432.

The previous prime is 853. The next prime is 857. The reversal of 855 is 558.

855 = 11^{2} + 12^{2} + ... + 15^{2}.

855 is nontrivially palindromic in base 4.

It is an interprime number because it is at equal distance from previous prime (853) and next prime (857).

It is not a de Polignac number, because 855 - 2^{1} = 853 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

855 is a Rhonda number in base 6.

855 is a lucky number.

It is a plaindrome in base 16.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36 + ... + 54.

It is an arithmetic number, because the mean of its divisors is an integer number (130).

855 is the 15-th decagonal number.

855 is a deficient number, since it is larger than the sum of its proper divisors (705).

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

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

The sum of its prime factors is 30 (or 27 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 855 is about 29.2403830344. The cubic root of 855 is about 9.4912199580.

The spelling of 855 in words is "eight hundred fifty-five", and thus it is an aban number and an oban number.

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