40004071 has 4 divisors (see below), whose sum is σ = 40259032. Its totient is φ = 39749112.

The previous prime is 40004057. The next prime is 40004087. The reversal of 40004071 is 17040004.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40004071 - 2⁵ = 40004039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40004011) 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, 127245 + ... + 127558.

It is an arithmetic number, because the mean of its divisors is an integer number (10064758).

Almost surely, 2^40004071 is an apocalyptic number.

40004071 is a deficient number, since it is larger than the sum of its proper divisors (254961).

40004071 is a wasteful number, since it uses less digits than its factorization.

40004071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254960.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 40004071 is about 6324.8771529572. The cubic root of 40004071 is about 342.0067911286.

Adding to 40004071 its reverse (17040004), we get a palindrome (57044075).

The spelling of 40004071 in words is "forty million, four thousand, seventy-one".