42087118 has 4 divisors (see below), whose sum is σ = 63130680. Its totient is φ = 21043558.

The previous prime is 42087061. The next prime is 42087151. The reversal of 42087118 is 81178024.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 42087118.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10521778 + ... + 10521781.

It is an arithmetic number, because the mean of its divisors is an integer number (15782670).

Almost surely, 2^42087118 is an apocalyptic number.

42087118 is a deficient number, since it is larger than the sum of its proper divisors (21043562).

42087118 is a wasteful number, since it uses less digits than its factorization.

42087118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21043561.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 42087118 is about 6487.4585162450. The cubic root of 42087118 is about 347.8428354041.

The spelling of 42087118 in words is "forty-two million, eighty-seven thousand, one hundred eighteen".