84869 has 2 divisors, whose sum is σ = 84870. Its totient is φ = 84868.

The previous prime is 84859. The next prime is 84871. The reversal of 84869 is 96848.

84869 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82369 + 2500 = 287^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 84869 - 2¹⁶ = 19333 is a prime.

It is a super-2 number, since 2×84869² = 14405494322, which contains 22 as substring.

Together with 84871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42434 + 42435.

It is an arithmetic number, because the mean of its divisors is an integer number (42435).

2⁸⁴⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

84869 is a deficient number, since it is larger than the sum of its proper divisors (1).

84869 is an equidigital number, since it uses as much as digits as its factorization.

84869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 84869 is about 291.3228449676. The cubic root of 84869 is about 43.9456974730.

The spelling of 84869 in words is "eighty-four thousand, eight hundred sixty-nine".