42904128409 has 4 divisors (see below), whose sum is σ = 43016150016. Its totient is φ = 42792106804.

The previous prime is 42904128391. The next prime is 42904128427. The reversal of 42904128409 is 90482140924.

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 (42904128391) and next prime (42904128427).

It is a cyclic number.

It is not a de Polignac number, because 42904128409 - 2¹¹ = 42904126361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42904128469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56010229 + ... + 56010994.

It is an arithmetic number, because the mean of its divisors is an integer number (10754037504).

Almost surely, 2^42904128409 is an apocalyptic number.

It is an amenable number.

42904128409 is a deficient number, since it is larger than the sum of its proper divisors (112021607).

42904128409 is a wasteful number, since it uses less digits than its factorization.

42904128409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112021606.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 42904128409 in words is "forty-two billion, nine hundred four million, one hundred twenty-eight thousand, four hundred nine".