6990839 has 2 divisors, whose sum is σ = 6990840. Its totient is φ = 6990838.

The previous prime is 6990829. The next prime is 6990853. The reversal of 6990839 is 9380996.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6990839 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6990839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6990829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495419 + 3495420.

It is an arithmetic number, because the mean of its divisors is an integer number (3495420).

Almost surely, 2^6990839 is an apocalyptic number.

6990839 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990839 is an equidigital number, since it uses as much as digits as its factorization.

6990839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 6990839 is about 2644.0194779918. The cubic root of 6990839 is about 191.2096325014.

The spelling of 6990839 in words is "six million, nine hundred ninety thousand, eight hundred thirty-nine".