8216839 has 2 divisors, whose sum is σ = 8216840. Its totient is φ = 8216838.

The previous prime is 8216833. The next prime is 8216843. The reversal of 8216839 is 9386128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8216839 - 2¹³ = 8208647 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8216798 and 8216807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8216833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4108419 + 4108420.

It is an arithmetic number, because the mean of its divisors is an integer number (4108420).

Almost surely, 2^8216839 is an apocalyptic number.

8216839 is a deficient number, since it is larger than the sum of its proper divisors (1).

8216839 is an equidigital number, since it uses as much as digits as its factorization.

8216839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 8216839 is about 2866.5029216800. The cubic root of 8216839 is about 201.7909070590.

The spelling of 8216839 in words is "eight million, two hundred sixteen thousand, eight hundred thirty-nine".