42408565 has 4 divisors (see below), whose sum is σ = 50890284. Its totient is φ = 33926848.

The previous prime is 42408559. The next prime is 42408571. The reversal of 42408565 is 56580424.

42408565 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 is an interprime number because it is at equal distance from previous prime (42408559) and next prime (42408571).

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 21696964 = 4551^2 + 4658^2 .

It is a cyclic number.

It is not a de Polignac number, because 42408565 - 2¹³ = 42400373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42408565.

It is a congruent number.

It is an unprimeable number.

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, 4240852 + ... + 4240861.

It is an arithmetic number, because the mean of its divisors is an integer number (12722571).

Almost surely, 2^42408565 is an apocalyptic number.

It is an amenable number.

42408565 is a deficient number, since it is larger than the sum of its proper divisors (8481719).

42408565 is an equidigital number, since it uses as much as digits as its factorization.

42408565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8481718.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 42408565 is about 6512.1858849391. The cubic root of 42408565 is about 348.7261585343.

Adding to 42408565 its reverse (56580424), we get a palindrome (98988989).

The spelling of 42408565 in words is "forty-two million, four hundred eight thousand, five hundred sixty-five".