198247 has 8 divisors (see below), whose sum is σ = 229376. Its totient is φ = 167832.

The previous prime is 198241. The next prime is 198251. The reversal of 198247 is 742891.

198247 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 198247 - 2¹⁵ = 165479 is a prime.

198247 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198241) 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, 778 + ... + 1000.

It is an arithmetic number, because the mean of its divisors is an integer number (28672).

2¹⁹⁸²⁴⁷ is an apocalyptic number.

198247 is the 223-rd decagonal number.

198247 is a deficient number, since it is larger than the sum of its proper divisors (31129).

198247 is a wasteful number, since it uses less digits than its factorization.

198247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357.

The product of its digits is 4032, while the sum is 31.

The square root of 198247 is about 445.2493683319. The cubic root of 198247 is about 58.3089930197.

Subtracting 198247 from its reverse (742891), we obtain a square (544644 = 738²).

The spelling of 198247 in words is "one hundred ninety-eight thousand, two hundred forty-seven".