404042042 has 4 divisors (see below), whose sum is σ = 606063066. Its totient is φ = 202021020.

The previous prime is 404042039. The next prime is 404042047. The reversal of 404042042 is 240240404.

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., 313962961 + 90079081 = 17719^2 + 9491^2 .

It is not an unprimeable number, because it can be changed into a prime (404042047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010509 + ... + 101010512.

Almost surely, 2^404042042 is an apocalyptic number.

404042042 is a deficient number, since it is larger than the sum of its proper divisors (202021024).

404042042 is a wasteful number, since it uses less digits than its factorization.

404042042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202021023.

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

The square root of 404042042 is about 20100.7970488735. The cubic root of 404042042 is about 739.2798216187.

Adding to 404042042 its reverse (240240404), we get a palindrome (644282446).

The spelling of 404042042 in words is "four hundred four million, forty-two thousand, forty-two".