239891 has 4 divisors (see below), whose sum is σ = 245784. Its totient is φ = 234000.

The previous prime is 239879. The next prime is 239893. The reversal of 239891 is 198932.

239891 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 239891 - 2¹⁴ = 223507 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239893) 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, 2885 + ... + 2966.

It is an arithmetic number, because the mean of its divisors is an integer number (61446).

2²³⁹⁸⁹¹ is an apocalyptic number.

239891 is a deficient number, since it is larger than the sum of its proper divisors (5893).

239891 is an equidigital number, since it uses as much as digits as its factorization.

239891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5892.

The product of its digits is 3888, while the sum is 32.

The square root of 239891 is about 489.7866882634. The cubic root of 239891 is about 62.1352406849.

It can be divided in two parts, 2 and 39891, that added together give a palindrome (39893).

The spelling of 239891 in words is "two hundred thirty-nine thousand, eight hundred ninety-one".