4042085 has 4 divisors (see below), whose sum is σ = 4850508. Its totient is φ = 3233664.

The previous prime is 4042081. The next prime is 4042091. The reversal of 4042085 is 5802404.

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 1965604 + 2076481 = 1402^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 4042085 - 2² = 4042081 is a prime.

It is a super-2 number, since 2×4042085² = 32676902294450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4042085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042081) 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, 404204 + ... + 404213.

It is an arithmetic number, because the mean of its divisors is an integer number (1212627).

Almost surely, 2^4042085 is an apocalyptic number.

It is an amenable number.

4042085 is a deficient number, since it is larger than the sum of its proper divisors (808423).

4042085 is an equidigital number, since it uses as much as digits as its factorization.

4042085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808422.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 4042085 is about 2010.4937204577. The cubic root of 4042085 is about 159.2948788618.

Adding to 4042085 its reverse (5802404), we get a palindrome (9844489).

The spelling of 4042085 in words is "four million, forty-two thousand, eighty-five".