4042440 has 128 divisors (see below), whose sum is σ = 14256000. Its totient is φ = 1016064.

The previous prime is 4042433. The next prime is 4042463. The reversal of 4042440 is 442404.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20422 + ... + 20618.

It is an arithmetic number, because the mean of its divisors is an integer number (111375).

Almost surely, 2^4042440 is an apocalyptic number.

4042440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4042440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7128000).

4042440 is an abundant number, since it is smaller than the sum of its proper divisors (10213560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4042440 is a wasteful number, since it uses less digits than its factorization.

4042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 4042440 is about 2010.5820052910. The cubic root of 4042440 is about 159.2995421339.

Adding to 4042440 its reverse (442404), we get a palindrome (4484844).

The spelling of 4042440 in words is "four million, forty-two thousand, four hundred forty".