42020729 has 2 divisors, whose sum is σ = 42020730. Its totient is φ = 42020728.

The previous prime is 42020687. The next prime is 42020743. The reversal of 42020729 is 92702024.

42020729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21409129 + 20611600 = 4627^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 42020729 - 2²⁴ = 25243513 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42020698 and 42020707.

It is not a weakly prime, because it can be changed into another prime (42020029) 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, 21010364 + 21010365.

It is an arithmetic number, because the mean of its divisors is an integer number (21010365).

Almost surely, 2^42020729 is an apocalyptic number.

It is an amenable number.

42020729 is a deficient number, since it is larger than the sum of its proper divisors (1).

42020729 is an equidigital number, since it uses as much as digits as its factorization.

42020729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 42020729 is about 6482.3397781974. The cubic root of 42020729 is about 347.6598412390.

The spelling of 42020729 in words is "forty-two million, twenty thousand, seven hundred twenty-nine".