128990207 has 2 divisors, whose sum is σ = 128990208. Its totient is φ = 128990206.

The previous prime is 128990179. The next prime is 128990219. The reversal of 128990207 is 702099821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128990207 - 2⁶ = 128990143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128990227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64495103 + 64495104.

It is an arithmetic number, because the mean of its divisors is an integer number (64495104).

Almost surely, 2^128990207 is an apocalyptic number.

128990207 is a deficient number, since it is larger than the sum of its proper divisors (1).

128990207 is an equidigital number, since it uses as much as digits as its factorization.

128990207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 128990207 is about 11357.3855706320. The cubic root of 128990207 is about 505.2646483975.

The spelling of 128990207 in words is "one hundred twenty-eight million, nine hundred ninety thousand, two hundred seven".