636425 has 6 divisors (see below), whose sum is σ = 789198. Its totient is φ = 509120.

The previous prime is 636421. The next prime is 636469. The reversal of 636425 is 524636.

It can be written as a sum of positive squares in 3 ways, for example, as 2809 + 633616 = 53^2 + 796^2 .

It is not a de Polignac number, because 636425 - 2² = 636421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 636394 and 636403.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636425.

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 5 ways as a sum of consecutive naturals, for example, 12704 + ... + 12753.

It is an arithmetic number, because the mean of its divisors is an integer number (131533).

2⁶³⁶⁴²⁵ is an apocalyptic number.

It is an amenable number.

636425 is a deficient number, since it is larger than the sum of its proper divisors (152773).

636425 is a wasteful number, since it uses less digits than its factorization.

636425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25467 (or 25462 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 636425 is about 797.7624959849. The cubic root of 636425 is about 86.0166273962.

The spelling of 636425 in words is "six hundred thirty-six thousand, four hundred twenty-five".