129827 has 4 divisors (see below), whose sum is σ = 136680. Its totient is φ = 122976.

The previous prime is 129803. The next prime is 129841. The reversal of 129827 is 728921.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 129827 - 2⁶ = 129763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129827.

It is not an unprimeable number, because it can be changed into a prime (129887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3398 + ... + 3435.

It is an arithmetic number, because the mean of its divisors is an integer number (34170).

2¹²⁹⁸²⁷ is an apocalyptic number.

129827 is a deficient number, since it is larger than the sum of its proper divisors (6853).

129827 is an equidigital number, since it uses as much as digits as its factorization.

129827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6852.

The product of its digits is 2016, while the sum is 29.

The square root of 129827 is about 360.3151398429. The cubic root of 129827 is about 50.6354888596.

The spelling of 129827 in words is "one hundred twenty-nine thousand, eight hundred twenty-seven".