6939681 has 16 divisors (see below), whose sum is σ = 10621824. Its totient is φ = 3947904.

The previous prime is 6939679. The next prime is 6939697. The reversal of 6939681 is 1869396.

It is not a de Polignac number, because 6939681 - 2¹ = 6939679 is a prime.

It is a super-2 number, since 2×6939681² = 96318344763522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6939601) 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, 5221 + ... + 6413.

It is an arithmetic number, because the mean of its divisors is an integer number (663864).

Almost surely, 2^6939681 is an apocalyptic number.

It is an amenable number.

6939681 is a deficient number, since it is larger than the sum of its proper divisors (3682143).

6939681 is a wasteful number, since it uses less digits than its factorization.

6939681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480.

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

The square root of 6939681 is about 2634.3274283961. The cubic root of 6939681 is about 190.7420748528.

The spelling of 6939681 in words is "six million, nine hundred thirty-nine thousand, six hundred eighty-one".