129206 has 16 divisors (see below), whose sum is σ = 241920. Its totient is φ = 50280.

The previous prime is 129197. The next prime is 129209. The reversal of 129206 is 602921.

129206 = T₁₅ + T₁₆ + ... + T₉₁.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129206.

It is not an unprimeable number, because it can be changed into a prime (129209) 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 7 ways as a sum of consecutive naturals, for example, 266 + ... + 573.

It is an arithmetic number, because the mean of its divisors is an integer number (15120).

2¹²⁹²⁰⁶ is an apocalyptic number.

129206 is a deficient number, since it is larger than the sum of its proper divisors (112714).

129206 is a wasteful number, since it uses less digits than its factorization.

129206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 129206 is about 359.4523612386. The cubic root of 129206 is about 50.5546250729.

The spelling of 129206 in words is "one hundred twenty-nine thousand, two hundred six".