42506009 has 16 divisors (see below), whose sum is σ = 52647168. Its totient is φ = 33417792.

The previous prime is 42506003. The next prime is 42506039. The reversal of 42506009 is 90060524.

It is a cyclic number.

It is not a de Polignac number, because 42506009 - 2⁴ = 42505993 is a prime.

It is a super-2 number, since 2×42506009² = 3613521602216162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42506003) 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 15 ways as a sum of consecutive naturals, for example, 13799 + ... + 16595.

It is an arithmetic number, because the mean of its divisors is an integer number (3290448).

Almost surely, 2^42506009 is an apocalyptic number.

It is an amenable number.

42506009 is a deficient number, since it is larger than the sum of its proper divisors (10141159).

42506009 is a wasteful number, since it uses less digits than its factorization.

42506009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 42506009 is about 6519.6632581752. The cubic root of 42506009 is about 348.9930486324.

The spelling of 42506009 in words is "forty-two million, five hundred six thousand, nine".