84989 has 4 divisors (see below), whose sum is σ = 87324. Its totient is φ = 82656.

The previous prime is 84979. The next prime is 84991. The reversal of 84989 is 98948.

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 60025 + 24964 = 245^2 + 158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1112 + ... + 1185.

It is an arithmetic number, because the mean of its divisors is an integer number (21831).

2⁸⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

84989 is a deficient number, since it is larger than the sum of its proper divisors (2335).

84989 is a wasteful number, since it uses less digits than its factorization.

84989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334.

The product of its digits is 20736, while the sum is 38.

The square root of 84989 is about 291.5287292875. The cubic root of 84989 is about 43.9663999681.

The spelling of 84989 in words is "eighty-four thousand, nine hundred eighty-nine".