42088639 has 2 divisors, whose sum is σ = 42088640. Its totient is φ = 42088638.

The previous prime is 42088637. The next prime is 42088649. The reversal of 42088639 is 93688024.

42088639 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 not a de Polignac number, because 42088639 - 2¹ = 42088637 is a prime.

Together with 42088637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42088637) 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, 21044319 + 21044320.

It is an arithmetic number, because the mean of its divisors is an integer number (21044320).

Almost surely, 2^42088639 is an apocalyptic number.

42088639 is a deficient number, since it is larger than the sum of its proper divisors (1).

42088639 is an equidigital number, since it uses as much as digits as its factorization.

42088639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 42088639 is about 6487.5757413690. The cubic root of 42088639 is about 347.8470256220.

The spelling of 42088639 in words is "forty-two million, eighty-eight thousand, six hundred thirty-nine".