6890 has 16 divisors (see below), whose sum is σ = 13608. Its totient is φ = 2496.

The previous prime is 6883. The next prime is 6899. The reversal of 6890 is 986.

It is a Cunningham number, because it is equal to 83²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 5041 + 1849 = 71^2 + 43^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104 + ... + 156.

6890 is a deficient number, since it is larger than the sum of its proper divisors (6718).

6890 is a wasteful number, since it uses less digits than its factorization.

6890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 6890 is about 83.0060238778. The cubic root of 6890 is about 19.0285811766.

The spelling of 6890 in words is "six thousand, eight hundred ninety".