198773 has 4 divisors (see below), whose sum is σ = 199980. Its totient is φ = 197568.

The previous prime is 198769. The next prime is 198811. The reversal of 198773 is 377891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 377891 = 19 ⋅19889.

It can be written as a sum of positive squares in 2 ways, for example, as 142129 + 56644 = 377^2 + 238^2 .

It is a cyclic number.

It is not a de Polignac number, because 198773 - 2² = 198769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308 + ... + 701.

It is an arithmetic number, because the mean of its divisors is an integer number (49995).

2¹⁹⁸⁷⁷³ is an apocalyptic number.

It is an amenable number.

198773 is a deficient number, since it is larger than the sum of its proper divisors (1207).

198773 is a wasteful number, since it uses less digits than its factorization.

198773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206.

The product of its digits is 10584, while the sum is 35.

The square root of 198773 is about 445.8396572760. The cubic root of 198773 is about 58.3605170355.

The spelling of 198773 in words is "one hundred ninety-eight thousand, seven hundred seventy-three".