198780 has 24 divisors (see below), whose sum is σ = 556752. Its totient is φ = 52992.

The previous prime is 198769. The next prime is 198811. The reversal of 198780 is 87891.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

198780 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1597 + ... + 1716.

It is an arithmetic number, because the mean of its divisors is an integer number (23198).

2¹⁹⁸⁷⁸⁰ is an apocalyptic number.

198780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198780 is an abundant number, since it is smaller than the sum of its proper divisors (357972).

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

198780 is a wasteful number, since it uses less digits than its factorization.

198780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325 (or 3323 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 198780 is about 445.8475075628. The cubic root of 198780 is about 58.3612021031.

Subtracting from 198780 its reverse (87891), we obtain a square (110889 = 333²).

The spelling of 198780 in words is "one hundred ninety-eight thousand, seven hundred eighty".