3999943 has 4 divisors (see below), whose sum is σ = 4017640. Its totient is φ = 3982248.

The previous prime is 3999929. The next prime is 3999949. The reversal of 3999943 is 3499993.

3999943 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 a cyclic number.

It is not a de Polignac number, because 3999943 - 2¹³ = 3991751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3999893 and 3999902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999949) 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, 8505 + ... + 8962.

It is an arithmetic number, because the mean of its divisors is an integer number (1004410).

Almost surely, 2^3999943 is an apocalyptic number.

3999943 is a deficient number, since it is larger than the sum of its proper divisors (17697).

3999943 is a wasteful number, since it uses less digits than its factorization.

3999943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17696.

The product of its digits is 236196, while the sum is 46.

The square root of 3999943 is about 1999.9857499492. The cubic root of 3999943 is about 158.7393511777.

The spelling of 3999943 in words is "three million, nine hundred ninety-nine thousand, nine hundred forty-three".