42120565 has 8 divisors (see below), whose sum is σ = 50584248. Its totient is φ = 33670080.

The previous prime is 42120563. The next prime is 42120569. The reversal of 42120565 is 56502124.

42120565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11229201 + 30891364 = 3351^2 + 5558^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42120565 - 2¹ = 42120563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42120563) 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 7 ways as a sum of consecutive naturals, for example, 6235 + ... + 11095.

It is an arithmetic number, because the mean of its divisors is an integer number (6323031).

Almost surely, 2^42120565 is an apocalyptic number.

It is an amenable number.

42120565 is a deficient number, since it is larger than the sum of its proper divisors (8463683).

42120565 is a wasteful number, since it uses less digits than its factorization.

42120565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6599.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 42120565 is about 6490.0358242463. The cubic root of 42120565 is about 347.9349555846.

Adding to 42120565 its reverse (56502124), we get a palindrome (98622689).

The spelling of 42120565 in words is "forty-two million, one hundred twenty thousand, five hundred sixty-five".