19898 has 4 divisors (see below), whose sum is σ = 29850. Its totient is φ = 9948.

The previous prime is 19891. The next prime is 19913. The reversal of 19898 is 89891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17689 + 2209 = 133^2 + 47^2 .

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (19891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4973 + ... + 4976.

2¹⁹⁸⁹⁸ is an apocalyptic number.

19898 is a deficient number, since it is larger than the sum of its proper divisors (9952).

19898 is an equidigital number, since it uses as much as digits as its factorization.

19898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9951.

The product of its digits is 5184, while the sum is 35.

The square root of 19898 is about 141.0602708065. The cubic root of 19898 is about 27.0979523968.

The spelling of 19898 in words is "nineteen thousand, eight hundred ninety-eight".