128903197 has 4 divisors (see below), whose sum is σ = 136485756. Its totient is φ = 121320640.

The previous prime is 128903191. The next prime is 128903209. The reversal of 128903197 is 791309821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116186841 + 12716356 = 10779^2 + 3566^2 .

It is a cyclic number.

It is not a de Polignac number, because 128903197 - 2³ = 128903189 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128903191) 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, 3791254 + ... + 3791287.

It is an arithmetic number, because the mean of its divisors is an integer number (34121439).

Almost surely, 2^128903197 is an apocalyptic number.

128903197 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128903197 is a deficient number, since it is larger than the sum of its proper divisors (7582559).

128903197 is an equidigital number, since it uses as much as digits as its factorization.

128903197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7582558.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 128903197 is about 11353.5543773745. The cubic root of 128903197 is about 505.1510145363.

The spelling of 128903197 in words is "one hundred twenty-eight million, nine hundred three thousand, one hundred ninety-seven".