4000071 has 4 divisors (see below), whose sum is σ = 5333432. Its totient is φ = 2666712.

The previous prime is 4000067. The next prime is 4000079. The reversal of 4000071 is 1700004.

4000071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 4000071 - 2² = 4000067 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666676 + ... + 666681.

It is an arithmetic number, because the mean of its divisors is an integer number (1333358).

Almost surely, 2^4000071 is an apocalyptic number.

4000071 is a deficient number, since it is larger than the sum of its proper divisors (1333361).

4000071 is a wasteful number, since it uses less digits than its factorization.

4000071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333360.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 4000071 is about 2000.0177499212. The cubic root of 4000071 is about 158.7410444036.

Adding to 4000071 its reverse (1700004), we get a palindrome (5700075).

The spelling of 4000071 in words is "four million, seventy-one", and thus it is an aban number.