84809839 has 2 divisors, whose sum is σ = 84809840. Its totient is φ = 84809838.

The previous prime is 84809827. The next prime is 84809869. The reversal of 84809839 is 93890848.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84809839 - 2⁵ = 84809807 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84809792 and 84809801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84809819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42404919 + 42404920.

It is an arithmetic number, because the mean of its divisors is an integer number (42404920).

Almost surely, 2^84809839 is an apocalyptic number.

84809839 is a deficient number, since it is larger than the sum of its proper divisors (1).

84809839 is an equidigital number, since it uses as much as digits as its factorization.

84809839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 84809839 is about 9209.2257546441. The cubic root of 84809839 is about 439.3548378778.

The spelling of 84809839 in words is "eighty-four million, eight hundred nine thousand, eight hundred thirty-nine".