42806389 has 2 divisors, whose sum is σ = 42806390. Its totient is φ = 42806388.

The previous prime is 42806383. The next prime is 42806399. The reversal of 42806389 is 98360824.

42806389 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 can be written as a sum of positive squares in only one way, i.e., 33258289 + 9548100 = 5767^2 + 3090^2 .

It is a cyclic number.

It is not a de Polignac number, because 42806389 - 2⁷ = 42806261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42806383) 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, 21403194 + 21403195.

It is an arithmetic number, because the mean of its divisors is an integer number (21403195).

Almost surely, 2^42806389 is an apocalyptic number.

It is an amenable number.

42806389 is a deficient number, since it is larger than the sum of its proper divisors (1).

42806389 is an equidigital number, since it uses as much as digits as its factorization.

42806389 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 42806389 is about 6542.6591688701. The cubic root of 42806389 is about 349.8132037252.

The spelling of 42806389 in words is "forty-two million, eight hundred six thousand, three hundred eighty-nine".