198326821 has 8 divisors (see below), whose sum is σ = 247264704. Its totient is φ = 154540320.

The previous prime is 198326801. The next prime is 198326837. The reversal of 198326821 is 128623891.

198326821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 198326821 - 2¹³ = 198318629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198326801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1287760 + ... + 1287913.

It is an arithmetic number, because the mean of its divisors is an integer number (30908088).

Almost surely, 2^198326821 is an apocalyptic number.

198326821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198326821 is a deficient number, since it is larger than the sum of its proper divisors (48937883).

198326821 is a wasteful number, since it uses less digits than its factorization.

198326821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575691.

The product of its digits is 41472, while the sum is 40.

The square root of 198326821 is about 14082.8555698054. The cubic root of 198326821 is about 583.1681769905.

The spelling of 198326821 in words is "one hundred ninety-eight million, three hundred twenty-six thousand, eight hundred twenty-one".