636475423 has 4 divisors (see below), whose sum is σ = 636906088. Its totient is φ = 636044760.

The previous prime is 636475417. The next prime is 636475493. The reversal of 636475423 is 324574636.

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 636475423 - 2⁹ = 636474911 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 (636475493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213108 + ... + 216073.

It is an arithmetic number, because the mean of its divisors is an integer number (159226522).

Almost surely, 2^636475423 is an apocalyptic number.

636475423 is a deficient number, since it is larger than the sum of its proper divisors (430665).

636475423 is a wasteful number, since it uses less digits than its factorization.

636475423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430664.

The product of its digits is 362880, while the sum is 40.

The square root of 636475423 is about 25228.4645390876. The cubic root of 636475423 is about 860.1889899238.

The spelling of 636475423 in words is "six hundred thirty-six million, four hundred seventy-five thousand, four hundred twenty-three".