636243 has 4 divisors (see below), whose sum is σ = 848328. Its totient is φ = 424160.

The previous prime is 636241. The next prime is 636247. The reversal of 636243 is 342636.

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 636243 - 2¹ = 636241 is a prime.

It is a super-3 number, since 3×636243³ = 772663338791522721, which contains 333 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (636241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106038 + ... + 106043.

It is an arithmetic number, because the mean of its divisors is an integer number (212082).

2⁶³⁶²⁴³ is an apocalyptic number.

636243 is a deficient number, since it is larger than the sum of its proper divisors (212085).

636243 is a wasteful number, since it uses less digits than its factorization.

636243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212084.

The product of its digits is 2592, while the sum is 24.

The square root of 636243 is about 797.6484187911. The cubic root of 636243 is about 86.0084271533.

Adding to 636243 its reverse (342636), we get a palindrome (978879).

The spelling of 636243 in words is "six hundred thirty-six thousand, two hundred forty-three".