42404039 has 2 divisors, whose sum is σ = 42404040. Its totient is φ = 42404038.

The previous prime is 42404027. The next prime is 42404083. The reversal of 42404039 is 93040424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42404039 - 2¹⁶ = 42338503 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42403999 and 42404017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42404839) 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, 21202019 + 21202020.

It is an arithmetic number, because the mean of its divisors is an integer number (21202020).

Almost surely, 2^42404039 is an apocalyptic number.

42404039 is a deficient number, since it is larger than the sum of its proper divisors (1).

42404039 is an equidigital number, since it uses as much as digits as its factorization.

42404039 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42404039 is about 6511.8383733014. The cubic root of 42404039 is about 348.7137523081.

The spelling of 42404039 in words is "forty-two million, four hundred four thousand, thirty-nine".