42018 has 16 divisors (see below), whose sum is σ = 86400. Its totient is φ = 13616.

The previous prime is 42017. The next prime is 42019. The reversal of 42018 is 81024.

It is an interprime number because it is at equal distance from previous prime (42017) and next prime (42019).

It is a plaindrome in base 7.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 41988 and 42006.

It is not an unprimeable number, because it can be changed into a prime (42013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208 + ... + 356.

It is an arithmetic number, because the mean of its divisors is an integer number (5400).

2⁴²⁰¹⁸ is an apocalyptic number.

42018 is an abundant number, since it is smaller than the sum of its proper divisors (44382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43200).

42018 is a wasteful number, since it uses less digits than its factorization.

42018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 42018 is about 204.9829261183. The cubic root of 42018 is about 34.7652314920.

The spelling of 42018 in words is "forty-two thousand, eighteen".