40440042442 has 16 divisors (see below), whose sum is σ = 64393435080. Its totient is φ = 18981680128.

The previous prime is 40440042439. The next prime is 40440042449. The reversal of 40440042442 is 24424004404.

It can be written as a sum of positive squares in 4 ways, for example, as 25382543761 + 15057498681 = 159319^2 + 122709^2 .

It is a super-2 number, since 2×40440042442² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40440042442.

It is not an unprimeable number, because it can be changed into a prime (40440042449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515583 + ... + 1542034.

Almost surely, 2^40440042442 is an apocalyptic number.

40440042442 is a deficient number, since it is larger than the sum of its proper divisors (23953392638).

40440042442 is a wasteful number, since it uses less digits than its factorization.

40440042442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058025.

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 40440042442 its reverse (24424004404), we get a palindrome (64864046846).

The spelling of 40440042442 in words is "forty billion, four hundred forty million, forty-two thousand, four hundred forty-two".