242839 has 4 divisors (see below), whose sum is σ = 255640. Its totient is φ = 230040.

The previous prime is 242819. The next prime is 242863. The reversal of 242839 is 938242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938242 = 2 ⋅469121.

It is a cyclic number.

It is not a de Polignac number, because 242839 - 2⁵ = 242807 is a prime.

It is a Duffinian number.

242839 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242819) 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 3 ways as a sum of consecutive naturals, for example, 6372 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (63910).

2²⁴²⁸³⁹ is an apocalyptic number.

242839 is a deficient number, since it is larger than the sum of its proper divisors (12801).

242839 is a wasteful number, since it uses less digits than its factorization.

242839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12800.

The product of its digits is 3456, while the sum is 28.

The square root of 242839 is about 492.7869722304. The cubic root of 242839 is about 62.3887300214.

It can be divided in two parts, 242 and 839, that added together give a triangular number (1081 = T₄₆).

The spelling of 242839 in words is "two hundred forty-two thousand, eight hundred thirty-nine".