863 can be written using four 4's:
See also 113
863 has 2
divisors, whose sum is σ = 864
Its totient is φ = 862
The previous prime is 859. The next prime is 877. The reversal of 863 is 368.
It is a happy number.
863 is nontrivially palindromic in base 13.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 863 - 22 = 859 is a prime.
It is a Chen prime.
It is a magnanimous number.
863 is an undulating number in base 13.
It is a plaindrome in base 6, base 9, base 12, base 14 and base 16.
It is a nialpdrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (823) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431 + 432.
It is an arithmetic number, because the mean of its divisors is an integer number (432).
863 is a deficient number, since it is larger than the sum of its proper divisors (1).
863 is an equidigital number, since it uses as much as digits as its factorization.
863 is an evil number, because the sum of its binary digits is even.
The product of its digits is 144, while the sum is 17.
The square root of 863 is about 29.3768616431.
The cubic root of 863 is about 9.5207303538.
The spelling of 863 in words is "eight hundred sixty-three", and thus it is an aban number and an oban number.