863863 has 16 divisors (see below), whose sum is σ = 1161216. Its totient is φ = 620640.

The previous prime is 863851. The next prime is 863867. The reversal of 863863 is 368368.

It is a cyclic number.

It is not a de Polignac number, because 863863 - 2¹³ = 855671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863867) 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 in 15 ways as a sum of consecutive naturals, for example, 570 + ... + 1432.

It is an arithmetic number, because the mean of its divisors is an integer number (72576).

2⁸⁶³⁸⁶³ is an apocalyptic number.

863863 is a deficient number, since it is larger than the sum of its proper divisors (297353).

863863 is a wasteful number, since it uses less digits than its factorization.

863863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894.

The product of its digits is 20736, while the sum is 34.

The square root of 863863 is about 929.4423059018. The cubic root of 863863 is about 95.2390287329.

The spelling of 863863 in words is "eight hundred sixty-three thousand, eight hundred sixty-three".