197780 has 48 divisors (see below), whose sum is σ = 483840. Its totient is φ = 67200.

The previous prime is 197779. The next prime is 197803. The reversal of 197780 is 87791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6365 + ... + 6395.

It is an arithmetic number, because the mean of its divisors is an integer number (10080).

2¹⁹⁷⁷⁸⁰ is an apocalyptic number.

197780 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 197780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241920).

197780 is an abundant number, since it is smaller than the sum of its proper divisors (286060).

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

197780 is a wasteful number, since it uses less digits than its factorization.

197780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 197780 is about 444.7246339028. The cubic root of 197780 is about 58.2631718817.

The spelling of 197780 in words is "one hundred ninety-seven thousand, seven hundred eighty".