636309 has 8 divisors (see below), whose sum is σ = 942720. Its totient is φ = 424188.

The previous prime is 636301. The next prime is 636313. The reversal of 636309 is 903636.

It is not a de Polignac number, because 636309 - 2³ = 636301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 23567 = 636309 / (6 + 3 + 6 + 3 + 0 + 9).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11757 + ... + 11810.

It is an arithmetic number, because the mean of its divisors is an integer number (117840).

2⁶³⁶³⁰⁹ is an apocalyptic number.

It is an amenable number.

636309 is a deficient number, since it is larger than the sum of its proper divisors (306411).

636309 is a wasteful number, since it uses less digits than its factorization.

636309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23576 (or 23570 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 636309 is about 797.6897893292. The cubic root of 636309 is about 86.0114010484.

It can be divided in two parts, 6 and 36309, that added together give a triangular number (36315 = T₂₆₉).

The spelling of 636309 in words is "six hundred thirty-six thousand, three hundred nine".