198647 has 2 divisors, whose sum is σ = 198648. Its totient is φ = 198646.

The previous prime is 198641. The next prime is 198659. The reversal of 198647 is 746891.

It is a weak prime.

It is an emirp because it is prime and its reverse (746891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198647 - 2⁸ = 198391 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198647.

It is not a weakly prime, because it can be changed into another prime (198641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99323 + 99324.

It is an arithmetic number, because the mean of its divisors is an integer number (99324).

2¹⁹⁸⁶⁴⁷ is an apocalyptic number.

198647 is a deficient number, since it is larger than the sum of its proper divisors (1).

198647 is an equidigital number, since it uses as much as digits as its factorization.

198647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 198647 is about 445.6983284689. The cubic root of 198647 is about 58.3481830675.

The spelling of 198647 in words is "one hundred ninety-eight thousand, six hundred forty-seven".