4040442 has 60 divisors (see below), whose sum is σ = 10552410. Its totient is φ = 1152144.

The previous prime is 4040431. The next prime is 4040459. The reversal of 4040442 is 2440404.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2893401 + 1147041 = 1701^2 + 1071^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 7684 + ... + 8192.

Almost surely, 2^4040442 is an apocalyptic number.

4040442 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 4040442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5276205).

4040442 is an abundant number, since it is smaller than the sum of its proper divisors (6511968).

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

4040442 is a wasteful number, since it uses less digits than its factorization.

4040442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 521 counting only the distinct ones).

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

The square root of 4040442 is about 2010.0850728265. The cubic root of 4040442 is about 159.2732928936.

Adding to 4040442 its reverse (2440404), we get a palindrome (6480846).

The spelling of 4040442 in words is "four million, forty thousand, four hundred forty-two".