636873 has 8 divisors (see below), whose sum is σ = 869088. Its totient is φ = 414624.

The previous prime is 636863. The next prime is 636877. The reversal of 636873 is 378636.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636873 - 2⁶ = 636809 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (636877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2340 + ... + 2597.

It is an arithmetic number, because the mean of its divisors is an integer number (108636).

2⁶³⁶⁸⁷³ is an apocalyptic number.

It is an amenable number.

636873 is a deficient number, since it is larger than the sum of its proper divisors (232215).

636873 is a wasteful number, since it uses less digits than its factorization.

636873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983.

The product of its digits is 18144, while the sum is 33.

The square root of 636873 is about 798.0432319117. The cubic root of 636873 is about 86.0368059511.

It can be divided in two parts, 6368 and 73, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 636873 in words is "six hundred thirty-six thousand, eight hundred seventy-three".