42865 has 4 divisors (see below), whose sum is σ = 51444. Its totient is φ = 34288.

The previous prime is 42863. The next prime is 42899. The reversal of 42865 is 56824.

42865 is digitally balanced in base 6, 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 can be written as a sum of positive squares in 2 ways, for example, as 14641 + 28224 = 121^2 + 168^2 .

It is a cyclic number.

It is not a de Polignac number, because 42865 - 2¹ = 42863 is a prime.

It is a Duffinian number.

42865 is strictly pandigital in base 6.

42865 is a lucky number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (42863) 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, 4282 + ... + 4291.

It is an arithmetic number, because the mean of its divisors is an integer number (12861).

2⁴²⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

42865 is a deficient number, since it is larger than the sum of its proper divisors (8579).

42865 is an equidigital number, since it uses as much as digits as its factorization.

42865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8578.

The product of its digits is 1920, while the sum is 25.

The square root of 42865 is about 207.0386437359. The cubic root of 42865 is about 34.9972787000.

The spelling of 42865 in words is "forty-two thousand, eight hundred sixty-five".