128929799 has 2 divisors, whose sum is σ = 128929800. Its totient is φ = 128929798.

The previous prime is 128929777. The next prime is 128929811. The reversal of 128929799 is 997929821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128929799 - 2²⁴ = 112152583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128929709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64464899 + 64464900.

It is an arithmetic number, because the mean of its divisors is an integer number (64464900).

Almost surely, 2^128929799 is an apocalyptic number.

128929799 is a deficient number, since it is larger than the sum of its proper divisors (1).

128929799 is an equidigital number, since it uses as much as digits as its factorization.

128929799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 56.

The square root of 128929799 is about 11354.7258443346. The cubic root of 128929799 is about 505.1857618074.

The spelling of 128929799 in words is "one hundred twenty-eight million, nine hundred twenty-nine thousand, seven hundred ninety-nine".