18869 has 2 divisors, whose sum is σ = 18870. Its totient is φ = 18868.

The previous prime is 18859. The next prime is 18899. The reversal of 18869 is 96881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18769 + 100 = 137^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18869 is a prime.

It is a super-2 number, since 2×18869² = 712078322, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434 + 9435.

It is an arithmetic number, because the mean of its divisors is an integer number (9435).

2¹⁸⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

18869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18869 is an equidigital number, since it uses as much as digits as its factorization.

18869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 18869 is about 137.3644786690. The cubic root of 18869 is about 26.6225485778.

The spelling of 18869 in words is "eighteen thousand, eight hundred sixty-nine".