129779 has 8 divisors (see below), whose sum is σ = 142800. Its totient is φ = 117216.

The previous prime is 129769. The next prime is 129793. The reversal of 129779 is 977921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129779 - 2⁴ = 129763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797 + ... + 945.

It is an arithmetic number, because the mean of its divisors is an integer number (17850).

2¹²⁹⁷⁷⁹ is an apocalyptic number.

129779 is a deficient number, since it is larger than the sum of its proper divisors (13021).

129779 is a wasteful number, since it uses less digits than its factorization.

129779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229.

The product of its digits is 7938, while the sum is 35.

The square root of 129779 is about 360.2485253266. The cubic root of 129779 is about 50.6292477257.

The spelling of 129779 in words is "one hundred twenty-nine thousand, seven hundred seventy-nine".