636823 has 12 divisors (see below), whose sum is σ = 739480. Its totient is φ = 546480.

The previous prime is 636821. The next prime is 636829. The reversal of 636823 is 328636.

It is not a de Polignac number, because 636823 - 2¹ = 636821 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 636791 and 636800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636821) 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 11 ways as a sum of consecutive naturals, for example, 2161 + ... + 2437.

2⁶³⁶⁸²³ is an apocalyptic number.

636823 is a deficient number, since it is larger than the sum of its proper divisors (102657).

636823 is a wasteful number, since it uses less digits than its factorization.

636823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 307 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 636823 is about 798.0119046731. The cubic root of 636823 is about 86.0345543495.

It can be divided in two parts, 63 and 6823, that added together give a palindrome (6886).

The spelling of 636823 in words is "six hundred thirty-six thousand, eight hundred twenty-three".