128297207 has 4 divisors (see below), whose sum is σ = 128444376. Its totient is φ = 128150040.

The previous prime is 128297203. The next prime is 128297219. The reversal of 128297207 is 702792821.

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

It is a cyclic number.

It is not a de Polignac number, because 128297207 - 2² = 128297203 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 (128297203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72269 + ... + 74022.

It is an arithmetic number, because the mean of its divisors is an integer number (32111094).

Almost surely, 2^128297207 is an apocalyptic number.

128297207 is a deficient number, since it is larger than the sum of its proper divisors (147169).

128297207 is an equidigital number, since it uses as much as digits as its factorization.

128297207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147168.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 128297207 is about 11326.8357011126. The cubic root of 128297207 is about 504.3581781950.

It can be divided in two parts, 1282 and 97207, that added together give a palindrome (98489).

The spelling of 128297207 in words is "one hundred twenty-eight million, two hundred ninety-seven thousand, two hundred seven".