636423 has 4 divisors (see below), whose sum is σ = 848568. Its totient is φ = 424280.

The previous prime is 636421. The next prime is 636469. The reversal of 636423 is 324636.

636423 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

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 636423 - 2¹ = 636421 is a prime.

It is a D-number.

636423 is strictly pandigital in base 7.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 636393 and 636402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636421) 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, 106068 + ... + 106073.

It is an arithmetic number, because the mean of its divisors is an integer number (212142).

2⁶³⁶⁴²³ is an apocalyptic number.

636423 is a deficient number, since it is larger than the sum of its proper divisors (212145).

636423 is a wasteful number, since it uses less digits than its factorization.

636423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212144.

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

The square root of 636423 is about 797.7612424780. The cubic root of 636423 is about 86.0165372921.

Adding to 636423 its product of digits (2592), we get a triangular number (639015 = T₁₁₃₀).

The spelling of 636423 in words is "six hundred thirty-six thousand, four hundred twenty-three".