19389 has 8 divisors (see below), whose sum is σ = 27072. Its totient is φ = 12320.

The previous prime is 19387. The next prime is 19391. The reversal of 19389 is 98391.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19387) and next prime (19391).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19389 - 2¹ = 19387 is a prime.

19389 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72 + ... + 209.

It is an arithmetic number, because the mean of its divisors is an integer number (3384).

2¹⁹³⁸⁹ is an apocalyptic number.

It is an amenable number.

19389 is a deficient number, since it is larger than the sum of its proper divisors (7683).

19389 is a wasteful number, since it uses less digits than its factorization.

19389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307.

The product of its digits is 1944, while the sum is 30.

The square root of 19389 is about 139.2443894740. The cubic root of 19389 is about 26.8648943436.

It can be divided in two parts, 193 and 89, that added together give a palindrome (282).

The spelling of 19389 in words is "nineteen thousand, three hundred eighty-nine".