42158789 has 2 divisors, whose sum is σ = 42158790. Its totient is φ = 42158788.

The previous prime is 42158737. The next prime is 42158801. The reversal of 42158789 is 98785124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40742689 + 1416100 = 6383^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 42158789 - 2¹⁶ = 42093253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42158719) 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, 21079394 + 21079395.

It is an arithmetic number, because the mean of its divisors is an integer number (21079395).

Almost surely, 2^42158789 is an apocalyptic number.

It is an amenable number.

42158789 is a deficient number, since it is larger than the sum of its proper divisors (1).

42158789 is an equidigital number, since it uses as much as digits as its factorization.

42158789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 42158789 is about 6492.9799784074. The cubic root of 42158789 is about 348.0401729507.

The spelling of 42158789 in words is "forty-two million, one hundred fifty-eight thousand, seven hundred eighty-nine".