84789 has 6 divisors (see below), whose sum is σ = 122486. Its totient is φ = 56520.

The previous prime is 84787. The next prime is 84793. The reversal of 84789 is 98748.

It can be written as a sum of positive squares in only one way, i.e., 66564 + 18225 = 258^2 + 135^2 .

It is not a de Polignac number, because 84789 - 2¹ = 84787 is a prime.

It is a Duffinian number.

84789 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84787) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4702 + ... + 4719.

2⁸⁴⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

84789 is a deficient number, since it is larger than the sum of its proper divisors (37697).

84789 is a wasteful number, since it uses less digits than its factorization.

84789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427 (or 9424 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 84789 is about 291.1855078811. The cubic root of 84789 is about 43.9318849658.

The spelling of 84789 in words is "eighty-four thousand, seven hundred eighty-nine".