128403659 has 2 divisors, whose sum is σ = 128403660. Its totient is φ = 128403658.

The previous prime is 128403631. The next prime is 128403679. The reversal of 128403659 is 956304821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128403659 - 2¹⁶ = 128338123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128403629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64201829 + 64201830.

It is an arithmetic number, because the mean of its divisors is an integer number (64201830).

Almost surely, 2^128403659 is an apocalyptic number.

128403659 is a deficient number, since it is larger than the sum of its proper divisors (1).

128403659 is an equidigital number, since it uses as much as digits as its factorization.

128403659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 128403659 is about 11331.5338326283. The cubic root of 128403659 is about 504.4976332813.

The spelling of 128403659 in words is "one hundred twenty-eight million, four hundred three thousand, six hundred fifty-nine".