42041987 has 4 divisors (see below), whose sum is σ = 45276000. Its totient is φ = 38807976.

The previous prime is 42041981. The next prime is 42042023. The reversal of 42041987 is 78914024.

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

It is a cyclic number.

It is not a de Polignac number, because 42041987 - 2¹⁰ = 42040963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42041981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616987 + ... + 1617012.

It is an arithmetic number, because the mean of its divisors is an integer number (11319000).

Almost surely, 2^42041987 is an apocalyptic number.

42041987 is a deficient number, since it is larger than the sum of its proper divisors (3234013).

42041987 is a wasteful number, since it uses less digits than its factorization.

42041987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234012.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 42041987 is about 6483.9792565985. The cubic root of 42041987 is about 347.7184576025.

The spelling of 42041987 in words is "forty-two million, forty-one thousand, nine hundred eighty-seven".