6681939 has 16 divisors (see below), whose sum is σ = 10231680. Its totient is φ = 3836160.

The previous prime is 6681931. The next prime is 6681947. The reversal of 6681939 is 9391866.

It is an interprime number because it is at equal distance from previous prime (6681931) and next prime (6681947).

It is not a de Polignac number, because 6681939 - 2³ = 6681931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6681939.

It is not an unprimeable number, because it can be changed into a prime (6681931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4702 + ... + 5955.

It is an arithmetic number, because the mean of its divisors is an integer number (639480).

Almost surely, 2^6681939 is an apocalyptic number.

6681939 is a deficient number, since it is larger than the sum of its proper divisors (3549741).

6681939 is a wasteful number, since it uses less digits than its factorization.

6681939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10690.

The product of its digits is 69984, while the sum is 42.

The square root of 6681939 is about 2584.9446802591. The cubic root of 6681939 is about 188.3508143292.

The spelling of 6681939 in words is "six million, six hundred eighty-one thousand, nine hundred thirty-nine".