42870009 has 32 divisors (see below), whose sum is σ = 70706944. Its totient is φ = 22498560.

The previous prime is 42869989. The next prime is 42870019. The reversal of 42870009 is 90007824.

42870009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42870009 - 2¹² = 42865913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42870019) 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 31 ways as a sum of consecutive naturals, for example, 101619 + ... + 102039.

It is an arithmetic number, because the mean of its divisors is an integer number (2209592).

Almost surely, 2^42870009 is an apocalyptic number.

It is an amenable number.

42870009 is a deficient number, since it is larger than the sum of its proper divisors (27836935).

42870009 is a wasteful number, since it uses less digits than its factorization.

42870009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 42870009 is about 6547.5193012316. The cubic root of 42870009 is about 349.9864185206.

The spelling of 42870009 in words is "forty-two million, eight hundred seventy thousand, nine".