636239 has 4 divisors (see below), whose sum is σ = 649824. Its totient is φ = 622656.

The previous prime is 636217. The next prime is 636241. The reversal of 636239 is 932636.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 636239 - 2⁸ = 635983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636539) 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, 6722 + ... + 6815.

It is an arithmetic number, because the mean of its divisors is an integer number (162456).

2⁶³⁶²³⁹ is an apocalyptic number.

636239 is a deficient number, since it is larger than the sum of its proper divisors (13585).

636239 is a wasteful number, since it uses less digits than its factorization.

636239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13584.

The product of its digits is 5832, while the sum is 29.

The square root of 636239 is about 797.6459114168. The cubic root of 636239 is about 86.0082469106.

The spelling of 636239 in words is "six hundred thirty-six thousand, two hundred thirty-nine".