129339305 has 4 divisors (see below), whose sum is σ = 155207172. Its totient is φ = 103471440.

The previous prime is 129339277. The next prime is 129339319. The reversal of 129339305 is 503933921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19571776 + 109767529 = 4424^2 + 10477^2 .

It is not a de Polignac number, because 129339305 - 2¹⁸ = 129077161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12933926 + ... + 12933935.

It is an arithmetic number, because the mean of its divisors is an integer number (38801793).

Almost surely, 2^129339305 is an apocalyptic number.

It is an amenable number.

129339305 is a deficient number, since it is larger than the sum of its proper divisors (25867867).

129339305 is an equidigital number, since it uses as much as digits as its factorization.

129339305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25867866.

The product of its (nonzero) digits is 21870, while the sum is 35.

The square root of 129339305 is about 11372.7439520988. The cubic root of 129339305 is about 505.7200524605.

The spelling of 129339305 in words is "one hundred twenty-nine million, three hundred thirty-nine thousand, three hundred five".