42439 has 6 divisors (see below), whose sum is σ = 45024. Its totient is φ = 39960.

The previous prime is 42437. The next prime is 42443. The reversal of 42439 is 93424.

It is not a de Polignac number, because 42439 - 2¹ = 42437 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 (42433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1129 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (7504).

2⁴²⁴³⁹ is an apocalyptic number.

42439 is a deficient number, since it is larger than the sum of its proper divisors (2585).

42439 is an equidigital number, since it uses as much as digits as its factorization.

42439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 68 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 42439 is about 206.0072814247. The cubic root of 42439 is about 34.8809561047.

The spelling of 42439 in words is "forty-two thousand, four hundred thirty-nine".