19849 has 4 divisors (see below), whose sum is σ = 20736. Its totient is φ = 18964.

The previous prime is 19843. The next prime is 19853. The reversal of 19849 is 94891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94891 = 31 ⋅3061.

It is a cyclic number.

It is not a de Polignac number, because 19849 - 2³ = 19841 is a prime.

It is a Duffinian number.

It is a plaindrome in base 5.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 19849.

It is not an unprimeable number, because it can be changed into a prime (19841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409 + ... + 454.

It is an arithmetic number, because the mean of its divisors is an integer number (5184).

2¹⁹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

19849 is a deficient number, since it is larger than the sum of its proper divisors (887).

19849 is an equidigital number, since it uses as much as digits as its factorization.

19849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886.

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

The square root of 19849 is about 140.8864791242. The cubic root of 19849 is about 27.0756906772.

It can be divided in two parts, 19 and 849, that added together give a palindrome (868).

The spelling of 19849 in words is "nineteen thousand, eight hundred forty-nine".