42685 has 4 divisors (see below), whose sum is σ = 51228. Its totient is φ = 34144.

The previous prime is 42683. The next prime is 42689. The reversal of 42685 is 58624.

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 27556 + 15129 = 166^2 + 123^2 .

It is a cyclic number.

It is not a de Polignac number, because 42685 - 2¹ = 42683 is a prime.

It is a super-3 number, since 3×42685³ = 233317391307375, which contains 333 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42683) 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, 4264 + ... + 4273.

It is an arithmetic number, because the mean of its divisors is an integer number (12807).

2⁴²⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

42685 is a deficient number, since it is larger than the sum of its proper divisors (8543).

42685 is an equidigital number, since it uses as much as digits as its factorization.

42685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8542.

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

The square root of 42685 is about 206.6034849658. The cubic root of 42685 is about 34.9482227609.

It can be divided in two parts, 42 and 685, that added together give a palindrome (727).

The spelling of 42685 in words is "forty-two thousand, six hundred eighty-five".