42508665 has 16 divisors (see below), whose sum is σ = 75571200. Its totient is φ = 22671216.

The previous prime is 42508663. The next prime is 42508667. The reversal of 42508665 is 56680524.

It is an interprime number because it is at equal distance from previous prime (42508663) and next prime (42508667).

It is not a de Polignac number, because 42508665 - 2¹ = 42508663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42508663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157305 + ... + 157574.

It is an arithmetic number, because the mean of its divisors is an integer number (4723200).

Almost surely, 2^42508665 is an apocalyptic number.

42508665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42508665 is a deficient number, since it is larger than the sum of its proper divisors (33062535).

42508665 is a wasteful number, since it uses less digits than its factorization.

42508665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314893 (or 314887 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 42508665 is about 6519.8669464952. The cubic root of 42508665 is about 349.0003174574. Note that the first 3 decimals are identical.

The spelling of 42508665 in words is "forty-two million, five hundred eight thousand, six hundred sixty-five".