8340439 has 4 divisors (see below), whose sum is σ = 8347320. Its totient is φ = 8333560.

The previous prime is 8340433. The next prime is 8340443. The reversal of 8340439 is 9340438.

8340439 is digitally balanced in base 3, 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, 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 8340439 - 2²¹ = 6243287 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8340439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8340433) 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, 1084 + ... + 4225.

It is an arithmetic number, because the mean of its divisors is an integer number (2086830).

Almost surely, 2^8340439 is an apocalyptic number.

8340439 is a deficient number, since it is larger than the sum of its proper divisors (6881).

8340439 is a wasteful number, since it uses less digits than its factorization.

8340439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6880.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 8340439 is about 2887.9818212724. The cubic root of 8340439 is about 202.7976742819.

Subtracting 8340439 from its reverse (9340438), we obtain a palindrome (999999).

The spelling of 8340439 in words is "eight million, three hundred forty thousand, four hundred thirty-nine".