863663 has 4 divisors (see below), whose sum is σ = 875568. Its totient is φ = 851760.

The previous prime is 863641. The next prime is 863671. The reversal of 863663 is 366368.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 863663 - 2¹² = 859567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863633) 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 3 ways as a sum of consecutive naturals, for example, 5843 + ... + 5988.

It is an arithmetic number, because the mean of its divisors is an integer number (218892).

2⁸⁶³⁶⁶³ is an apocalyptic number.

863663 is a deficient number, since it is larger than the sum of its proper divisors (11905).

863663 is a wasteful number, since it uses less digits than its factorization.

863663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11904.

The product of its digits is 15552, while the sum is 32.

The square root of 863663 is about 929.3347082725. The cubic root of 863663 is about 95.2316783097.

The spelling of 863663 in words is "eight hundred sixty-three thousand, six hundred sixty-three".