19798 has 8 divisors (see below), whose sum is σ = 31320. Its totient is φ = 9360.

The previous prime is 19793. The next prime is 19801. The reversal of 19798 is 89791.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19793) by changing a digit.

19798 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223 + ... + 298.

It is an arithmetic number, because the mean of its divisors is an integer number (3915).

2¹⁹⁷⁹⁸ is an apocalyptic number.

19798 is a deficient number, since it is larger than the sum of its proper divisors (11522).

19798 is a wasteful number, since it uses less digits than its factorization.

19798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542.

The product of its digits is 4536, while the sum is 34.

The square root of 19798 is about 140.7053659247. The cubic root of 19798 is about 27.0524813707.

It can be divided in two parts, 197 and 98, that multiplied together give a triangular number (19306 = T₁₉₆).

The spelling of 19798 in words is "nineteen thousand, seven hundred ninety-eight".