42135665 has 32 divisors (see below), whose sum is σ = 61350912. Its totient is φ = 27360000.

The previous prime is 42135661. The next prime is 42135671. The reversal of 42135665 is 56653124.

It is not a de Polignac number, because 42135665 - 2² = 42135661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42135661) 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 31 ways as a sum of consecutive naturals, for example, 21215 + ... + 23115.

It is an arithmetic number, because the mean of its divisors is an integer number (1917216).

Almost surely, 2^42135665 is an apocalyptic number.

It is an amenable number.

42135665 is a deficient number, since it is larger than the sum of its proper divisors (19215247).

42135665 is a wasteful number, since it uses less digits than its factorization.

42135665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961.

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

The square root of 42135665 is about 6491.1990417796. The cubic root of 42135665 is about 347.9765282315.

Adding to 42135665 its reverse (56653124), we get a palindrome (98788789).

The spelling of 42135665 in words is "forty-two million, one hundred thirty-five thousand, six hundred sixty-five".