42865871 has 4 divisors (see below), whose sum is σ = 43347600. Its totient is φ = 42384144.

The previous prime is 42865861. The next prime is 42865873. The reversal of 42865871 is 17856824.

42865871 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 42865871 - 2⁶ = 42865807 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 (42865873) 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, 240731 + ... + 240908.

It is an arithmetic number, because the mean of its divisors is an integer number (10836900).

Almost surely, 2^42865871 is an apocalyptic number.

42865871 is a deficient number, since it is larger than the sum of its proper divisors (481729).

42865871 is an equidigital number, since it uses as much as digits as its factorization.

42865871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481728.

The product of its digits is 107520, while the sum is 41.

The square root of 42865871 is about 6547.2032960647. The cubic root of 42865871 is about 349.9751574204.

The spelling of 42865871 in words is "forty-two million, eight hundred sixty-five thousand, eight hundred seventy-one".