42416809 has 4 divisors (see below), whose sum is σ = 42478020. Its totient is φ = 42355600.

The previous prime is 42416789. The next prime is 42416827. The reversal of 42416809 is 90861424.

42416809 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.

It can be written as a sum of positive squares in 2 ways, for example, as 39187600 + 3229209 = 6260^2 + 1797^2 .

It is a cyclic number.

It is not a de Polignac number, because 42416809 - 2⁷ = 42416681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42416849) 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, 29554 + ... + 30955.

It is an arithmetic number, because the mean of its divisors is an integer number (10619505).

Almost surely, 2^42416809 is an apocalyptic number.

It is an amenable number.

42416809 is a deficient number, since it is larger than the sum of its proper divisors (61211).

42416809 is an equidigital number, since it uses as much as digits as its factorization.

42416809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61210.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 42416809 is about 6512.8188213707. The cubic root of 42416809 is about 348.7487539084.

The spelling of 42416809 in words is "forty-two million, four hundred sixteen thousand, eight hundred nine".