636447 has 8 divisors (see below), whose sum is σ = 969856. Its totient is φ = 363672.

The previous prime is 636421. The next prime is 636469. The reversal of 636447 is 744636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636447 - 2⁷ = 636319 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636447.

It is not an unprimeable number, because it can be changed into a prime (636407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15133 + ... + 15174.

It is an arithmetic number, because the mean of its divisors is an integer number (121232).

2⁶³⁶⁴⁴⁷ is an apocalyptic number.

636447 is a deficient number, since it is larger than the sum of its proper divisors (333409).

636447 is a wasteful number, since it uses less digits than its factorization.

636447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30317.

The product of its digits is 12096, while the sum is 30.

The square root of 636447 is about 797.7762844307. The cubic root of 636447 is about 86.0176185284.

The spelling of 636447 in words is "six hundred thirty-six thousand, four hundred forty-seven".