42865787 has 4 divisors (see below), whose sum is σ = 43911336. Its totient is φ = 41820240.

The previous prime is 42865769. The next prime is 42865807. The reversal of 42865787 is 78756824.

42865787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42865787 - 2⁸ = 42865531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42865717) 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 3 ways as a sum of consecutive naturals, for example, 522713 + ... + 522794.

It is an arithmetic number, because the mean of its divisors is an integer number (10977834).

Almost surely, 2^42865787 is an apocalyptic number.

42865787 is a deficient number, since it is larger than the sum of its proper divisors (1045549).

42865787 is a wasteful number, since it uses less digits than its factorization.

42865787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045548.

The product of its digits is 752640, while the sum is 47.

The square root of 42865787 is about 6547.1968811087. The cubic root of 42865787 is about 349.9749288164.

The spelling of 42865787 in words is "forty-two million, eight hundred sixty-five thousand, seven hundred eighty-seven".