128205197 has 8 divisors (see below), whose sum is σ = 135665280. Its totient is φ = 120902320.

The previous prime is 128205157. The next prime is 128205223. The reversal of 128205197 is 791502821.

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 128205197 - 2¹⁰ = 128204173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128205127) 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, 37622 + ... + 40887.

It is an arithmetic number, because the mean of its divisors is an integer number (16958160).

Almost surely, 2^128205197 is an apocalyptic number.

It is an amenable number.

128205197 is a deficient number, since it is larger than the sum of its proper divisors (7460083).

128205197 is an equidigital number, since it uses as much as digits as its factorization.

128205197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78603.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 128205197 is about 11322.7733793448. The cubic root of 128205197 is about 504.2375803658.

The spelling of 128205197 in words is "one hundred twenty-eight million, two hundred five thousand, one hundred ninety-seven".