42403639 has 2 divisors, whose sum is σ = 42403640. Its totient is φ = 42403638.

The previous prime is 42403637. The next prime is 42403643. The reversal of 42403639 is 93630424.

42403639 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 42403639 - 2¹ = 42403637 is a prime.

Together with 42403637, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 42403639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42403637) 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, 21201819 + 21201820.

It is an arithmetic number, because the mean of its divisors is an integer number (21201820).

Almost surely, 2^42403639 is an apocalyptic number.

42403639 is a deficient number, since it is larger than the sum of its proper divisors (1).

42403639 is an equidigital number, since it uses as much as digits as its factorization.

42403639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 42403639 is about 6511.8076599359. The cubic root of 42403639 is about 348.7126558250.

The spelling of 42403639 in words is "forty-two million, four hundred three thousand, six hundred thirty-nine".