4042440405 has 16 divisors (see below), whose sum is σ = 7186560960. Its totient is φ = 2155968144.

The previous prime is 4042440403. The next prime is 4042440407. The reversal of 4042440405 is 5040442404.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4042440403) and next prime (4042440407).

It is not a de Polignac number, because 4042440405 - 2¹ = 4042440403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042440403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14971867 + ... + 14972136.

It is an arithmetic number, because the mean of its divisors is an integer number (449160060).

Almost surely, 2^4042440405 is an apocalyptic number.

4042440405 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4042440405 is a deficient number, since it is larger than the sum of its proper divisors (3144120555).

4042440405 is a wasteful number, since it uses less digits than its factorization.

4042440405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29944017 (or 29944011 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 27.

The square root of 4042440405 is about 63580.1887776373. The cubic root of 4042440405 is about 1592.9954745386.

Adding to 4042440405 its reverse (5040442404), we get a palindrome (9082882809).

The spelling of 4042440405 in words is "four billion, forty-two million, four hundred forty thousand, four hundred five".