636426 has 24 divisors (see below), whose sum is σ = 1576224. Its totient is φ = 181800.

The previous prime is 636421. The next prime is 636469. The reversal of 636426 is 624636.

636426 is a `hidden beast` number, since 636 + 4 + 26 = 666.

It is a super-3 number, since 3×636426³ = 773330244664550328, which contains 333 as substring.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 636426.

It is not an unprimeable number, because it can be changed into a prime (636421) by changing a digit.

636426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2400 + ... + 2651.

It is an arithmetic number, because the mean of its divisors is an integer number (65676).

2⁶³⁶⁴²⁶ is an apocalyptic number.

636426 is an abundant number, since it is smaller than the sum of its proper divisors (939798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636426 is a wasteful number, since it uses less digits than its factorization.

636426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5066 (or 5063 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 636426 is about 797.7631227376. The cubic root of 636426 is about 86.0166724481.

The spelling of 636426 in words is "six hundred thirty-six thousand, four hundred twenty-six".