198646 has 12 divisors (see below), whose sum is σ = 346788. Its totient is φ = 85092.

The previous prime is 198641. The next prime is 198647. The reversal of 198646 is 646891.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 916 + ... + 1111.

It is an arithmetic number, because the mean of its divisors is an integer number (28899).

2¹⁹⁸⁶⁴⁶ is an apocalyptic number.

198646 is a deficient number, since it is larger than the sum of its proper divisors (148142).

198646 is a wasteful number, since it uses less digits than its factorization.

198646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043 (or 2036 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 198646 is about 445.6972066325. The cubic root of 198646 is about 58.3480851580.

The spelling of 198646 in words is "one hundred ninety-eight thousand, six hundred forty-six".