400040404042 has 4 divisors (see below), whose sum is σ = 600060606066. Its totient is φ = 200020202020.

The previous prime is 400040404031. The next prime is 400040404051. The reversal of 400040404042 is 240404040004.

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., 392864450521 + 7175953521 = 626789^2 + 84711^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010101009 + ... + 100010101012.

Almost surely, 2^400040404042 is an apocalyptic number.

400040404042 is a deficient number, since it is larger than the sum of its proper divisors (200020202024).

400040404042 is a wasteful number, since it uses less digits than its factorization.

400040404042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200020202023.

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 400040404042 its reverse (240404040004), we get a palindrome (640444444046).

The spelling of 400040404042 in words is "four hundred billion, forty million, four hundred four thousand, forty-two".