42839 has 2 divisors, whose sum is σ = 42840. Its totient is φ = 42838.

The previous prime is 42829. The next prime is 42841. The reversal of 42839 is 93824.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42839 is a prime.

Together with 42841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21419 + 21420.

It is an arithmetic number, because the mean of its divisors is an integer number (21420).

2⁴²⁸³⁹ is an apocalyptic number.

42839 is a deficient number, since it is larger than the sum of its proper divisors (1).

42839 is an equidigital number, since it uses as much as digits as its factorization.

42839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 42839 is about 206.9758440012. The cubic root of 42839 is about 34.9902013386.

The spelling of 42839 in words is "forty-two thousand, eight hundred thirty-nine".