42040665 has 48 divisors (see below), whose sum is σ = 76826880. Its totient is φ = 21225600.

The previous prime is 42040637. The next prime is 42040667. The reversal of 42040665 is 56604024.

It is a happy number.

42040665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42040665 - 2⁶ = 42040601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42040667) 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 47 ways as a sum of consecutive naturals, for example, 156151 + ... + 156419.

It is an arithmetic number, because the mean of its divisors is an integer number (1600560).

Almost surely, 2^42040665 is an apocalyptic number.

42040665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42040665 is a deficient number, since it is larger than the sum of its proper divisors (34786215).

42040665 is a wasteful number, since it uses less digits than its factorization.

42040665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 42040665 is about 6483.8773122261. The cubic root of 42040665 is about 347.7148129237.

Adding to 42040665 its reverse (56604024), we get a palindrome (98644689).

The spelling of 42040665 in words is "forty-two million, forty thousand, six hundred sixty-five".