6678839 has 2 divisors, whose sum is σ = 6678840. Its totient is φ = 6678838.

The previous prime is 6678817. The next prime is 6678851. The reversal of 6678839 is 9388766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6678839 - 2¹² = 6674743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6678793 and 6678802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6671839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3339419 + 3339420.

It is an arithmetic number, because the mean of its divisors is an integer number (3339420).

Almost surely, 2^6678839 is an apocalyptic number.

6678839 is a deficient number, since it is larger than the sum of its proper divisors (1).

6678839 is an equidigital number, since it uses as much as digits as its factorization.

6678839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 6678839 is about 2584.3449847108. The cubic root of 6678839 is about 188.3216821744.

The spelling of 6678839 in words is "six million, six hundred seventy-eight thousand, eight hundred thirty-nine".