84505 has 4 divisors (see below), whose sum is σ = 101412. Its totient is φ = 67600.

The previous prime is 84503. The next prime is 84509. The reversal of 84505 is 50548.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67081 + 17424 = 259^2 + 132^2 .

It is not a de Polignac number, because 84505 - 2¹ = 84503 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8446 + ... + 8455.

It is an arithmetic number, because the mean of its divisors is an integer number (25353).

2⁸⁴⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

84505 is a deficient number, since it is larger than the sum of its proper divisors (16907).

84505 is a wasteful number, since it uses less digits than its factorization.

84505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16906.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 84505 is about 290.6974372092. The cubic root of 84505 is about 43.8827802806.

The spelling of 84505 in words is "eighty-four thousand, five hundred five".