198340 has 24 divisors (see below), whose sum is σ = 427392. Its totient is φ = 77280.

The previous prime is 198337. The next prime is 198347. The reversal of 198340 is 43891.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (198347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835 + ... + 1045.

It is an arithmetic number, because the mean of its divisors is an integer number (17808).

2¹⁹⁸³⁴⁰ is an apocalyptic number.

198340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198340 is an abundant number, since it is smaller than the sum of its proper divisors (229052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198340 is a wasteful number, since it uses less digits than its factorization.

198340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 198340 is about 445.3537919452. The cubic root of 198340 is about 58.3181094059.

Subtracting from 198340 its reverse (43891), we obtain a square (154449 = 393²).

The spelling of 198340 in words is "one hundred ninety-eight thousand, three hundred forty".