4042805 has 24 divisors (see below), whose sum is σ = 5499816. Its totient is φ = 2833920.

The previous prime is 4042789. The next prime is 4042807. The reversal of 4042805 is 5082404.

It can be written as a sum of positive squares in 12 ways, for example, as 2845969 + 1196836 = 1687^2 + 1094^2 .

It is not a de Polignac number, because 4042805 - 2⁴ = 4042789 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98585 + ... + 98625.

It is an arithmetic number, because the mean of its divisors is an integer number (229159).

Almost surely, 2^4042805 is an apocalyptic number.

It is an amenable number.

4042805 is a deficient number, since it is larger than the sum of its proper divisors (1457011).

4042805 is a wasteful number, since it uses less digits than its factorization.

4042805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 96 counting only the distinct ones).

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

The square root of 4042805 is about 2010.6727729792. The cubic root of 4042805 is about 159.3043364812.

The spelling of 4042805 in words is "four million, forty-two thousand, eight hundred five".