4042400042 has 4 divisors (see below), whose sum is σ = 6063600066. Its totient is φ = 2021200020.

The previous prime is 4042400027. The next prime is 4042400077. The reversal of 4042400042 is 2400042404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3687039841 + 355360201 = 60721^2 + 18851^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4042399987 and 4042400023.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010600009 + ... + 1010600012.

Almost surely, 2^4042400042 is an apocalyptic number.

4042400042 is a deficient number, since it is larger than the sum of its proper divisors (2021200024).

4042400042 is a wasteful number, since it uses less digits than its factorization.

4042400042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021200023.

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

The square root of 4042400042 is about 63579.8713587878. The cubic root of 4042400042 is about 1592.9901726018.

Adding to 4042400042 its reverse (2400042404), we get a palindrome (6442442446).

The spelling of 4042400042 in words is "four billion, forty-two million, four hundred thousand, forty-two".