6820439 has 4 divisors (see below), whose sum is σ = 6826656. Its totient is φ = 6814224.

The previous prime is 6820433. The next prime is 6820441. The reversal of 6820439 is 9340286.

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 6820439 - 2²⁰ = 5771863 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 (6820433) 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, 974 + ... + 3819.

It is an arithmetic number, because the mean of its divisors is an integer number (1706664).

Almost surely, 2^6820439 is an apocalyptic number.

6820439 is a deficient number, since it is larger than the sum of its proper divisors (6217).

6820439 is a wasteful number, since it uses less digits than its factorization.

6820439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6216.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 6820439 is about 2611.5970209816. The cubic root of 6820439 is about 189.6432734136.

The spelling of 6820439 in words is "six million, eight hundred twenty thousand, four hundred thirty-nine".