42917687 has 4 divisors (see below), whose sum is σ = 43017696. Its totient is φ = 42817680.

The previous prime is 42917683. The next prime is 42917729. The reversal of 42917687 is 78671924.

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 42917687 - 2² = 42917683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42917681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49358 + ... + 50219.

It is an arithmetic number, because the mean of its divisors is an integer number (10754424).

Almost surely, 2^42917687 is an apocalyptic number.

42917687 is a deficient number, since it is larger than the sum of its proper divisors (100009).

42917687 is an equidigital number, since it uses as much as digits as its factorization.

42917687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100008.

The product of its digits is 169344, while the sum is 44.

The square root of 42917687 is about 6551.1592103993. The cubic root of 42917687 is about 350.1161165748.

The spelling of 42917687 in words is "forty-two million, nine hundred seventeen thousand, six hundred eighty-seven".