42135439 has 2 divisors, whose sum is σ = 42135440. Its totient is φ = 42135438.

The previous prime is 42135433. The next prime is 42135449. The reversal of 42135439 is 93453124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42135439 - 2⁷ = 42135311 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42135439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42135433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21067719 + 21067720.

It is an arithmetic number, because the mean of its divisors is an integer number (21067720).

Almost surely, 2^42135439 is an apocalyptic number.

42135439 is a deficient number, since it is larger than the sum of its proper divisors (1).

42135439 is an equidigital number, since it uses as much as digits as its factorization.

42135439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 42135439 is about 6491.1816335703. The cubic root of 42135439 is about 347.9759060916.

The spelling of 42135439 in words is "forty-two million, one hundred thirty-five thousand, four hundred thirty-nine".