84808709 has 2 divisors, whose sum is σ = 84808710. Its totient is φ = 84808708.

The previous prime is 84808681. The next prime is 84808739. The reversal of 84808709 is 90780848.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81993025 + 2815684 = 9055^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 84808709 - 2²⁰ = 83760133 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 84808709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84808739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42404354 + 42404355.

It is an arithmetic number, because the mean of its divisors is an integer number (42404355).

Almost surely, 2^84808709 is an apocalyptic number.

It is an amenable number.

84808709 is a deficient number, since it is larger than the sum of its proper divisors (1).

84808709 is an equidigital number, since it uses as much as digits as its factorization.

84808709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 84808709 is about 9209.1644029195. The cubic root of 84808709 is about 439.3528865587.

The spelling of 84808709 in words is "eighty-four million, eight hundred eight thousand, seven hundred nine".