198740 has 24 divisors (see below), whose sum is σ = 440160. Its totient is φ = 75168.

The previous prime is 198733. The next prime is 198761. The reversal of 198740 is 47891.

198740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

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 198740.

It is an unprimeable number.

198740 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, 119 + ... + 641.

It is an arithmetic number, because the mean of its divisors is an integer number (18340).

2¹⁹⁸⁷⁴⁰ is an apocalyptic number.

198740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220080).

198740 is an abundant number, since it is smaller than the sum of its proper divisors (241420).

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

198740 is a wasteful number, since it uses less digits than its factorization.

198740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 198740 is about 445.8026469190. The cubic root of 198740 is about 58.3572872144.

The spelling of 198740 in words is "one hundred ninety-eight thousand, seven hundred forty".