197989 has 8 divisors (see below), whose sum is σ = 221760. Its totient is φ = 175200.

The previous prime is 197971. The next prime is 198013. The reversal of 197989 is 989791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197989 - 2⁵ = 197957 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232 + ... + 670.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2¹⁹⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

197989 is a deficient number, since it is larger than the sum of its proper divisors (23771).

197989 is a wasteful number, since it uses less digits than its factorization.

197989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its digits is 40824, while the sum is 43.

The square root of 197989 is about 444.9595487233. The cubic root of 197989 is about 58.2836874650.

It can be divided in two parts, 19 and 7989, that added together give a palindrome (8008).

The spelling of 197989 in words is "one hundred ninety-seven thousand, nine hundred eighty-nine".