4000943 has 4 divisors (see below), whose sum is σ = 4005120. Its totient is φ = 3996768.

The previous prime is 4000939. The next prime is 4000949. The reversal of 4000943 is 3490004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4000943 - 2² = 4000939 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 (4000949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146 + ... + 2832.

It is an arithmetic number, because the mean of its divisors is an integer number (1001280).

Almost surely, 2^4000943 is an apocalyptic number.

4000943 is a deficient number, since it is larger than the sum of its proper divisors (4177).

4000943 is a wasteful number, since it uses less digits than its factorization.

4000943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 4000943 is about 2000.2357361071. The cubic root of 4000943 is about 158.7525785433.

Adding to 4000943 its reverse (3490004), we get a palindrome (7490947).

The spelling of 4000943 in words is "four million, nine hundred forty-three", and thus it is an aban number.