6939643 has 2 divisors, whose sum is σ = 6939644. Its totient is φ = 6939642.

The previous prime is 6939623. The next prime is 6939649. The reversal of 6939643 is 3469396.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6939643 - 2¹³ = 6931451 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6939596 and 6939605.

It is not a weakly prime, because it can be changed into another prime (6939649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3469821 + 3469822.

It is an arithmetic number, because the mean of its divisors is an integer number (3469822).

Almost surely, 2^6939643 is an apocalyptic number.

6939643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6939643 is an equidigital number, since it uses as much as digits as its factorization.

6939643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 40.

The square root of 6939643 is about 2634.3202159191. The cubic root of 6939643 is about 190.7417266998.

The spelling of 6939643 in words is "six million, nine hundred thirty-nine thousand, six hundred forty-three".