239639 has 4 divisors (see below), whose sum is σ = 245256. Its totient is φ = 234024.

The previous prime is 239633. The next prime is 239641. The reversal of 239639 is 936932.

239639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 239639 - 2⁴ = 239623 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 (239633) 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, 2744 + ... + 2829.

It is an arithmetic number, because the mean of its divisors is an integer number (61314).

2²³⁹⁶³⁹ is an apocalyptic number.

239639 is a deficient number, since it is larger than the sum of its proper divisors (5617).

239639 is an equidigital number, since it uses as much as digits as its factorization.

239639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5616.

The product of its digits is 8748, while the sum is 32.

The square root of 239639 is about 489.5293658199. The cubic root of 239639 is about 62.1134758463.

It can be divided in two parts, 239 and 639, that added together give a palindrome (878).

The spelling of 239639 in words is "two hundred thirty-nine thousand, six hundred thirty-nine".