197128 has 16 divisors (see below), whose sum is σ = 379260. Its totient is φ = 96000.

The previous prime is 197123. The next prime is 197137. The reversal of 197128 is 821791.

It can be written as a sum of positive squares in 2 ways, for example, as 195364 + 1764 = 442^2 + 42^2 .

It is a junction number, because it is equal to n+sod(n) for n = 197096 and 197105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28 + ... + 628.

2¹⁹⁷¹²⁸ is an apocalyptic number.

It is an amenable number.

197128 is a deficient number, since it is larger than the sum of its proper divisors (182132).

197128 is a wasteful number, since it uses less digits than its factorization.

197128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 644 counting only the distinct ones).

The product of its digits is 1008, while the sum is 28.

The square root of 197128 is about 443.9909908996. The cubic root of 197128 is about 58.1990780942.

It can be divided in two parts, 197 and 128, that added together give a triangular number (325 = T₂₅).

The spelling of 197128 in words is "one hundred ninety-seven thousand, one hundred twenty-eight".