6939 has 8 divisors (see below), whose sum is σ = 10320. Its totient is φ = 4608.

The previous prime is 6917. The next prime is 6947. The reversal of 6939 is 9396.

6939 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 6939 - 2⁵ = 6907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 257 = 6939 / (6 + 9 + 3 + 9).

It is a d-powerful number, because it can be written as 6³ + 3⁸ + 9² + 9² .

6939 is an undulating number in base 16.

It is not an unprimeable number, because it can be changed into a prime (6949) 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, 102 + ... + 155.

It is an arithmetic number, because the mean of its divisors is an integer number (1290).

2⁶⁹³⁹ is an apocalyptic number.

6939 is a deficient number, since it is larger than the sum of its proper divisors (3381).

6939 is a wasteful number, since it uses less digits than its factorization.

6939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 260 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 6939 is about 83.3006602615. The cubic root of 6939 is about 19.0735835392.

The spelling of 6939 in words is "six thousand, nine hundred thirty-nine".