42540065 has 4 divisors (see below), whose sum is σ = 51048084. Its totient is φ = 34032048.

The previous prime is 42540059. The next prime is 42540067. The reversal of 42540065 is 56004524.

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 26635921 + 15904144 = 5161^2 + 3988^2 .

It is a cyclic number.

It is not a de Polignac number, because 42540065 - 2¹⁶ = 42474529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42540067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4254002 + ... + 4254011.

It is an arithmetic number, because the mean of its divisors is an integer number (12762021).

Almost surely, 2^42540065 is an apocalyptic number.

It is an amenable number.

42540065 is a deficient number, since it is larger than the sum of its proper divisors (8508019).

42540065 is an equidigital number, since it uses as much as digits as its factorization.

42540065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8508018.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 42540065 is about 6522.2745265743. The cubic root of 42540065 is about 349.0862286695.

Adding to 42540065 its reverse (56004524), we get a palindrome (98544589).

The spelling of 42540065 in words is "forty-two million, five hundred forty thousand, sixty-five".