84085789 has 2 divisors, whose sum is σ = 84085790. Its totient is φ = 84085788.

The previous prime is 84085759. The next prime is 84085829. The reversal of 84085789 is 98758048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 30063289 = 7350^2 + 5483^2 .

It is a cyclic number.

It is not a de Polignac number, because 84085789 - 2¹⁹ = 83561501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84085759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42042894 + 42042895.

It is an arithmetic number, because the mean of its divisors is an integer number (42042895).

Almost surely, 2^84085789 is an apocalyptic number.

It is an amenable number.

84085789 is a deficient number, since it is larger than the sum of its proper divisors (1).

84085789 is an equidigital number, since it uses as much as digits as its factorization.

84085789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 84085789 is about 9169.8303692053. The cubic root of 84085789 is about 438.1009563438.

The spelling of 84085789 in words is "eighty-four million, eighty-five thousand, seven hundred eighty-nine".