6839405 has 4 divisors (see below), whose sum is σ = 8207292. Its totient is φ = 5471520.

The previous prime is 6839401. The next prime is 6839419. The reversal of 6839405 is 5049386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5049386 = 2 ⋅2524693.

It can be written as a sum of positive squares in 2 ways, for example, as 4519876 + 2319529 = 2126^2 + 1523^2 .

It is not a de Polignac number, because 6839405 - 2² = 6839401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6839401) 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, 683936 + ... + 683945.

It is an arithmetic number, because the mean of its divisors is an integer number (2051823).

Almost surely, 2^6839405 is an apocalyptic number.

It is an amenable number.

6839405 is a deficient number, since it is larger than the sum of its proper divisors (1367887).

6839405 is a wasteful number, since it uses less digits than its factorization.

6839405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367886.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 6839405 is about 2615.2256116825. The cubic root of 6839405 is about 189.8188948335.

The spelling of 6839405 in words is "six million, eight hundred thirty-nine thousand, four hundred five".