40400240042 has 8 divisors (see below), whose sum is σ = 60601243716. Its totient is φ = 20199825472.

The previous prime is 40400240021. The next prime is 40400240057. The reversal of 40400240042 is 24004200404.

It can be written as a sum of positive squares in 2 ways, for example, as 35978123041 + 4422117001 = 189679^2 + 66499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 40400239996 and 40400240023.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 124418 + ... + 310290.

Almost surely, 2^40400240042 is an apocalyptic number.

40400240042 is a deficient number, since it is larger than the sum of its proper divisors (20201003674).

40400240042 is a wasteful number, since it uses less digits than its factorization.

40400240042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294552.

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 40400240042 its reverse (24004200404), we get a palindrome (64404440446).

The spelling of 40400240042 in words is "forty billion, four hundred million, two hundred forty thousand, forty-two".