42018165 has 24 divisors (see below), whose sum is σ = 83236608. Its totient is φ = 19208160.

The previous prime is 42018161. The next prime is 42018173. The reversal of 42018165 is 56181024.

42018165 is a `hidden beast` number, since 420 + 181 + 65 = 666.

It is not a de Polignac number, because 42018165 - 2² = 42018161 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42018161) 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 23 ways as a sum of consecutive naturals, for example, 66381 + ... + 67010.

It is an arithmetic number, because the mean of its divisors is an integer number (3468192).

Almost surely, 2^42018165 is an apocalyptic number.

42018165 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42018165 is a deficient number, since it is larger than the sum of its proper divisors (41218443).

42018165 is a wasteful number, since it uses less digits than its factorization.

42018165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133409 (or 133406 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 42018165 is about 6482.1420070838. The cubic root of 42018165 is about 347.6527699833.

Adding to 42018165 its reverse (56181024), we get a palindrome (98199189).

The spelling of 42018165 in words is "forty-two million, eighteen thousand, one hundred sixty-five".