198373321 has 8 divisors (see below), whose sum is σ = 207486720. Its totient is φ = 189300672.

The previous prime is 198373303. The next prime is 198373327. The reversal of 198373321 is 123373891.

198373321 = T₁₉₆ + T₁₉₇ + ... + T₁₀₆₁.

198373321 is a nontrivial binomial coefficient, being equal to C(19919, 2).

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

It is a de Polignac number, because none of the positive numbers 2^k-198373321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198373327) 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, 1 + ... + 19918.

It is an arithmetic number, because the mean of its divisors is an integer number (25935840).

Almost surely, 2^198373321 is an apocalyptic number.

198373321 is the 19918-th triangular number.

198373321 is the 6640-th centered nonagonal number.

It is an amenable number.

198373321 is a deficient number, since it is larger than the sum of its proper divisors (9113399).

198373321 is a wasteful number, since it uses less digits than its factorization.

198373321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20375.

The product of its digits is 27216, while the sum is 37.

The square root of 198373321 is about 14084.5064166267. The cubic root of 198373321 is about 583.2137502536.

The spelling of 198373321 in words is "one hundred ninety-eight million, three hundred seventy-three thousand, three hundred twenty-one".