6905 has 4 divisors (see below), whose sum is σ = 8292. Its totient is φ = 5520.

The previous prime is 6899. The next prime is 6907. The reversal of 6905 is 5096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2809 + 4096 = 53^2 + 64^2 .

It is not a de Polignac number, because 6905 - 2⁶ = 6841 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6907) 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, 686 + ... + 695.

It is an arithmetic number, because the mean of its divisors is an integer number (2073).

2⁶⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

6905 is a deficient number, since it is larger than the sum of its proper divisors (1387).

6905 is a wasteful number, since it uses less digits than its factorization.

6905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 6905 is about 83.0963296422. The cubic root of 6905 is about 19.0423800075.

The spelling of 6905 in words is "six thousand, nine hundred five".