42240065 has 16 divisors (see below), whose sum is σ = 58305792. Its totient is φ = 28776384.

The previous prime is 42240049. The next prime is 42240089. The reversal of 42240065 is 56004224.

It is not a de Polignac number, because 42240065 - 2⁴ = 42240049 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 42240065.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1652 + ... + 9338.

It is an arithmetic number, because the mean of its divisors is an integer number (3644112).

Almost surely, 2^42240065 is an apocalyptic number.

It is an amenable number.

42240065 is a deficient number, since it is larger than the sum of its proper divisors (16065727).

42240065 is a wasteful number, since it uses less digits than its factorization.

42240065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7856.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 42240065 is about 6499.2357242987. The cubic root of 42240065 is about 348.2636862858.

Adding to 42240065 its reverse (56004224), we get a palindrome (98244289).

The spelling of 42240065 in words is "forty-two million, two hundred forty thousand, sixty-five".