19698 has 24 divisors (see below), whose sum is σ = 46512. Its totient is φ = 5544.

The previous prime is 19697. The next prime is 19699. The reversal of 19698 is 89691.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19697) and next prime (19699).

It is a super-2 number, since 2×19698² = 776022408, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (19697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261 + ... + 327.

It is an arithmetic number, because the mean of its divisors is an integer number (1938).

2¹⁹⁶⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23256).

19698 is an abundant number, since it is smaller than the sum of its proper divisors (26814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19698 is a wasteful number, since it uses less digits than its factorization.

19698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 79 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 19698 is about 140.3495635903. The cubic root of 19698 is about 27.0068569690.

It can be divided in two parts, 19 and 698, that added together give a palindrome (717).

The spelling of 19698 in words is "nineteen thousand, six hundred ninety-eight".