4042439 has 4 divisors (see below), whose sum is σ = 4050720. Its totient is φ = 4034160.

The previous prime is 4042433. The next prime is 4042463. The reversal of 4042439 is 9342404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4042439 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 (4042433) 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, 3359 + ... + 4400.

It is an arithmetic number, because the mean of its divisors is an integer number (1012680).

Almost surely, 2^4042439 is an apocalyptic number.

4042439 is a deficient number, since it is larger than the sum of its proper divisors (8281).

4042439 is an equidigital number, since it uses as much as digits as its factorization.

4042439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8280.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 4042439 is about 2010.5817566068. The cubic root of 4042439 is about 159.2995289983.

The spelling of 4042439 in words is "four million, forty-two thousand, four hundred thirty-nine".