6439943 has 4 divisors (see below), whose sum is σ = 6662040. Its totient is φ = 6217848.

The previous prime is 6439933. The next prime is 6439949. The reversal of 6439943 is 3499346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3499346 = 2 ⋅1749673.

It is a cyclic number.

It is not a de Polignac number, because 6439943 - 2¹⁴ = 6423559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6439897 and 6439906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439949) 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, 111005 + ... + 111062.

It is an arithmetic number, because the mean of its divisors is an integer number (1665510).

Almost surely, 2^6439943 is an apocalyptic number.

6439943 is a deficient number, since it is larger than the sum of its proper divisors (222097).

6439943 is a wasteful number, since it uses less digits than its factorization.

6439943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222096.

The product of its digits is 69984, while the sum is 38.

The square root of 6439943 is about 2537.7042774918. The cubic root of 6439943 is about 186.0490004634.

The spelling of 6439943 in words is "six million, four hundred thirty-nine thousand, nine hundred forty-three".