42308009 has 4 divisors (see below), whose sum is σ = 42324816. Its totient is φ = 42291204.

The previous prime is 42307981. The next prime is 42308047. The reversal of 42308009 is 90080324.

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 a cyclic number.

It is not a de Polignac number, because 42308009 - 2²⁰ = 41259433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42308069) 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 in 3 ways as a sum of consecutive naturals, for example, 3779 + ... + 9944.

It is an arithmetic number, because the mean of its divisors is an integer number (10581204).

Almost surely, 2^42308009 is an apocalyptic number.

It is an amenable number.

42308009 is a deficient number, since it is larger than the sum of its proper divisors (16807).

42308009 is a wasteful number, since it uses less digits than its factorization.

42308009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16806.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 42308009 is about 6504.4607001657. The cubic root of 42308009 is about 348.4503159865.

The spelling of 42308009 in words is "forty-two million, three hundred eight thousand, nine".