42539429 has 2 divisors, whose sum is σ = 42539430. Its totient is φ = 42539428.

The previous prime is 42539417. The next prime is 42539467. The reversal of 42539429 is 92493524.

It is a happy number.

It is an a-pointer prime, because the next prime (42539467) can be obtained adding 42539429 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21836929 + 20702500 = 4673^2 + 4550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42539429 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42539392 and 42539401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42539479) 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, 21269714 + 21269715.

It is an arithmetic number, because the mean of its divisors is an integer number (21269715).

Almost surely, 2^42539429 is an apocalyptic number.

It is an amenable number.

42539429 is a deficient number, since it is larger than the sum of its proper divisors (1).

42539429 is an equidigital number, since it uses as much as digits as its factorization.

42539429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 42539429 is about 6522.2257703946. The cubic root of 42539429 is about 349.0844889766.

The spelling of 42539429 in words is "forty-two million, five hundred thirty-nine thousand, four hundred twenty-nine".