42315665 has 12 divisors (see below), whose sum is σ = 59069556. Its totient is φ = 29016288.

The previous prime is 42315661. The next prime is 42315683. The reversal of 42315665 is 56651324.

42315665 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 2 ways, for example, as 17405584 + 24910081 = 4172^2 + 4991^2 .

It is not a de Polignac number, because 42315665 - 2² = 42315661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42315661) 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 11 ways as a sum of consecutive naturals, for example, 86114 + ... + 86603.

It is an arithmetic number, because the mean of its divisors is an integer number (4922463).

Almost surely, 2^42315665 is an apocalyptic number.

It is an amenable number.

42315665 is a deficient number, since it is larger than the sum of its proper divisors (16753891).

42315665 is a wasteful number, since it uses less digits than its factorization.

42315665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172736 (or 172729 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 42315665 is about 6505.0491927425. The cubic root of 42315665 is about 348.4713330845.

Adding to 42315665 its reverse (56651324), we get a palindrome (98966989).

The spelling of 42315665 in words is "forty-two million, three hundred fifteen thousand, six hundred sixty-five".