197988 has 24 divisors (see below), whose sum is σ = 528192. Its totient is φ = 56544.

The previous prime is 197971. The next prime is 198013. The reversal of 197988 is 889791.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1095 + ... + 1262.

It is an arithmetic number, because the mean of its divisors is an integer number (22008).

2¹⁹⁷⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

197988 is an abundant number, since it is smaller than the sum of its proper divisors (330204).

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

197988 is a wasteful number, since it uses less digits than its factorization.

197988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371 (or 2369 counting only the distinct ones).

The product of its digits is 36288, while the sum is 42.

The square root of 197988 is about 444.9584250242. The cubic root of 197988 is about 58.2835893387.

The spelling of 197988 in words is "one hundred ninety-seven thousand, nine hundred eighty-eight".