19489 has 2 divisors, whose sum is σ = 19490. Its totient is φ = 19488.

The previous prime is 19483. The next prime is 19501. The reversal of 19489 is 98491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11025 + 8464 = 105^2 + 92^2 .

It is an emirp because it is prime and its reverse (98491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19489 - 2⁵ = 19457 is a prime.

It is a super-2 number, since 2×19489² = 759642242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19489.

It is not a weakly prime, because it can be changed into another prime (19483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9744 + 9745.

It is an arithmetic number, because the mean of its divisors is an integer number (9745).

2¹⁹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

19489 is a deficient number, since it is larger than the sum of its proper divisors (1).

19489 is an equidigital number, since it uses as much as digits as its factorization.

19489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 19489 is about 139.6030085636. The cubic root of 19489 is about 26.9110009684.

The spelling of 19489 in words is "nineteen thousand, four hundred eighty-nine".