400118042 has 4 divisors (see below), whose sum is σ = 600177066. Its totient is φ = 200059020.

The previous prime is 400118039. The next prime is 400118083. The reversal of 400118042 is 240811004.

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., 286929721 + 113188321 = 16939^2 + 10639^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100029509 + ... + 100029512.

Almost surely, 2^400118042 is an apocalyptic number.

400118042 is a deficient number, since it is larger than the sum of its proper divisors (200059024).

400118042 is a wasteful number, since it uses less digits than its factorization.

400118042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200059023.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 400118042 is about 20002.9508323147. The cubic root of 400118042 is about 736.8787710074.

Adding to 400118042 its reverse (240811004), we get a palindrome (640929046).

The spelling of 400118042 in words is "four hundred million, one hundred eighteen thousand, forty-two".