128857207 has 2 divisors, whose sum is σ = 128857208. Its totient is φ = 128857206.

The previous prime is 128857171. The next prime is 128857243. The reversal of 128857207 is 702758821.

It is a balanced prime because it is at equal distance from previous prime (128857171) and next prime (128857243).

It is a cyclic number.

It is not a de Polignac number, because 128857207 - 2¹¹ = 128855159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128857207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128857007) 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 as a sum of consecutive naturals, namely, 64428603 + 64428604.

It is an arithmetic number, because the mean of its divisors is an integer number (64428604).

Almost surely, 2^128857207 is an apocalyptic number.

128857207 is a deficient number, since it is larger than the sum of its proper divisors (1).

128857207 is an equidigital number, since it uses as much as digits as its factorization.

128857207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 128857207 is about 11351.5288397643. The cubic root of 128857207 is about 505.0909315719.

The spelling of 128857207 in words is "one hundred twenty-eight million, eight hundred fifty-seven thousand, two hundred seven".