129028439 has 2 divisors, whose sum is σ = 129028440. Its totient is φ = 129028438.

The previous prime is 129028433. The next prime is 129028451. The reversal of 129028439 is 934820921.

It is a weak prime.

It is an emirp because it is prime and its reverse (934820921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129028439 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 (129028433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64514219 + 64514220.

It is an arithmetic number, because the mean of its divisors is an integer number (64514220).

Almost surely, 2^129028439 is an apocalyptic number.

129028439 is a deficient number, since it is larger than the sum of its proper divisors (1).

129028439 is an equidigital number, since it uses as much as digits as its factorization.

129028439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 129028439 is about 11359.0685797736. The cubic root of 129028439 is about 505.3145627031.

The spelling of 129028439 in words is "one hundred twenty-nine million, twenty-eight thousand, four hundred thirty-nine".