40004042 has 8 divisors (see below), whose sum is σ = 64621956. Its totient is φ = 18463392.

The previous prime is 40004039. The next prime is 40004047. The reversal of 40004042 is 24040004.

It can be written as a sum of positive squares in 2 ways, for example, as 29041321 + 10962721 = 5389^2 + 3311^2 .

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

It is not an unprimeable number, because it can be changed into a prime (40004047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769283 + ... + 769334.

Almost surely, 2^40004042 is an apocalyptic number.

40004042 is a deficient number, since it is larger than the sum of its proper divisors (24617914).

40004042 is a wasteful number, since it uses less digits than its factorization.

40004042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538632.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 40004042 is about 6324.8748604221. The cubic root of 40004042 is about 342.0067084853.

Adding to 40004042 its reverse (24040004), we get a palindrome (64044046).

The spelling of 40004042 in words is "forty million, four thousand, forty-two", and thus it is an eban number.