42239 has 2 divisors, whose sum is σ = 42240. Its totient is φ = 42238.

The previous prime is 42227. The next prime is 42257. The reversal of 42239 is 93224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42239 - 2⁴ = 42223 is a prime.

It is a Chen prime.

It is a plaindrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 42239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42209) 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 as a sum of consecutive naturals, namely, 21119 + 21120.

It is an arithmetic number, because the mean of its divisors is an integer number (21120).

2⁴²²³⁹ is an apocalyptic number.

42239 is a deficient number, since it is larger than the sum of its proper divisors (1).

42239 is an equidigital number, since it uses as much as digits as its factorization.

42239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 42239 is about 205.5212884350. The cubic root of 42239 is about 34.8260759334.

The spelling of 42239 in words is "forty-two thousand, two hundred thirty-nine".