128403629 has 2 divisors, whose sum is σ = 128403630. Its totient is φ = 128403628.

The previous prime is 128403617. The next prime is 128403631. The reversal of 128403629 is 926304821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82773604 + 45630025 = 9098^2 + 6755^2 .

It is a cyclic number.

It is not a de Polignac number, because 128403629 - 2¹² = 128399533 is a prime.

Together with 128403631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128403659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64201814 + 64201815.

It is an arithmetic number, because the mean of its divisors is an integer number (64201815).

Almost surely, 2^128403629 is an apocalyptic number.

It is an amenable number.

128403629 is a deficient number, since it is larger than the sum of its proper divisors (1).

128403629 is an equidigital number, since it uses as much as digits as its factorization.

128403629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 128403629 is about 11331.5325088886. The cubic root of 128403629 is about 504.4975939914.

The spelling of 128403629 in words is "one hundred twenty-eight million, four hundred three thousand, six hundred twenty-nine".