42308509 has 4 divisors (see below), whose sum is σ = 42426720. Its totient is φ = 42190300.

The previous prime is 42308491. The next prime is 42308527. The reversal of 42308509 is 90580324.

42308509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (42308491) and next prime (42308527).

It is a cyclic number.

It is not a de Polignac number, because 42308509 - 2¹¹ = 42306461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42318509) 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 in 3 ways as a sum of consecutive naturals, for example, 58567 + ... + 59284.

It is an arithmetic number, because the mean of its divisors is an integer number (10606680).

Almost surely, 2^42308509 is an apocalyptic number.

It is an amenable number.

42308509 is a deficient number, since it is larger than the sum of its proper divisors (118211).

42308509 is a wasteful number, since it uses less digits than its factorization.

42308509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118210.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 42308509 is about 6504.4991352140. The cubic root of 42308509 is about 348.4516886539.

The spelling of 42308509 in words is "forty-two million, three hundred eight thousand, five hundred nine".