42118987 has 8 divisors (see below), whose sum is σ = 44653952. Its totient is φ = 39657600.

The previous prime is 42118963. The next prime is 42118997. The reversal of 42118987 is 78981124.

It is a happy number.

42118987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42118987 - 2²³ = 33730379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42118907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17214 + ... + 19507.

It is an arithmetic number, because the mean of its divisors is an integer number (5581744).

Almost surely, 2^42118987 is an apocalyptic number.

42118987 is a deficient number, since it is larger than the sum of its proper divisors (2534965).

42118987 is a wasteful number, since it uses less digits than its factorization.

42118987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36789.

The product of its digits is 32256, while the sum is 40.

The square root of 42118987 is about 6489.9142521300. The cubic root of 42118987 is about 347.9306105319.

The spelling of 42118987 in words is "forty-two million, one hundred eighteen thousand, nine hundred eighty-seven".