42438839 has 2 divisors, whose sum is σ = 42438840. Its totient is φ = 42438838.

The previous prime is 42438833. The next prime is 42438857. The reversal of 42438839 is 93883424.

It is a happy number.

42438839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42438839 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42438796 and 42438805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42438833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21219419 + 21219420.

It is an arithmetic number, because the mean of its divisors is an integer number (21219420).

Almost surely, 2^42438839 is an apocalyptic number.

42438839 is a deficient number, since it is larger than the sum of its proper divisors (1).

42438839 is an equidigital number, since it uses as much as digits as its factorization.

42438839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 41.

The square root of 42438839 is about 6514.5098817946. The cubic root of 42438839 is about 348.8091199561.

The spelling of 42438839 in words is "forty-two million, four hundred thirty-eight thousand, eight hundred thirty-nine".