42518 has 8 divisors (see below), whose sum is σ = 72912. Its totient is φ = 18216.

The previous prime is 42509. The next prime is 42533. The reversal of 42518 is 81524.

It is a sphenic number, since it is the product of 3 distinct primes.

42518 is a modest number, since divided by 518 gives 42 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42518.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 42518.

It is an unprimeable number.

42518 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505 + ... + 1532.

It is an arithmetic number, because the mean of its divisors is an integer number (9114).

2⁴²⁵¹⁸ is an apocalyptic number.

42518 is a deficient number, since it is larger than the sum of its proper divisors (30394).

42518 is a wasteful number, since it uses less digits than its factorization.

42518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046.

The product of its digits is 320, while the sum is 20.

The square root of 42518 is about 206.1989330719. The cubic root of 42518 is about 34.9025862677.

The spelling of 42518 in words is "forty-two thousand, five hundred eighteen".