636923 has 4 divisors (see below), whose sum is σ = 727920. Its totient is φ = 545928.

The previous prime is 636919. The next prime is 636931. The reversal of 636923 is 329636.

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 636923 - 2² = 636919 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45488 + ... + 45501.

It is an arithmetic number, because the mean of its divisors is an integer number (181980).

2⁶³⁶⁹²³ is an apocalyptic number.

636923 is a deficient number, since it is larger than the sum of its proper divisors (90997).

636923 is an equidigital number, since it uses as much as digits as its factorization.

636923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90996.

The product of its digits is 5832, while the sum is 29.

The square root of 636923 is about 798.0745579205. The cubic root of 636923 is about 86.0390574349.

The spelling of 636923 in words is "six hundred thirty-six thousand, nine hundred twenty-three".