198221819 has 8 divisors (see below), whose sum is σ = 211141728. Its totient is φ = 185441920.

The previous prime is 198221809. The next prime is 198221833. The reversal of 198221819 is 918122891.

It is a happy number.

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 198221819 - 2²⁰ = 197173243 is a prime.

It is a super-2 number, since 2×198221819² = 78583779055337522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198221809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32072 + ... + 37749.

It is an arithmetic number, because the mean of its divisors is an integer number (26392716).

Almost surely, 2^198221819 is an apocalyptic number.

198221819 is a deficient number, since it is larger than the sum of its proper divisors (12919909).

198221819 is a wasteful number, since it uses less digits than its factorization.

198221819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70005.

The product of its digits is 20736, while the sum is 41.

The square root of 198221819 is about 14079.1270681104. The cubic root of 198221819 is about 583.0652414516.

The spelling of 198221819 in words is "one hundred ninety-eight million, two hundred twenty-one thousand, eight hundred nineteen".