129200 has 60 divisors (see below), whose sum is σ = 345960. Its totient is φ = 46080.

The previous prime is 129197. The next prime is 129209. The reversal of 129200 is 2921.

129200 = T₁₁₉ + T₁₂₀ + ... + T₁₃₄.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6791 + ... + 6809.

It is an arithmetic number, because the mean of its divisors is an integer number (5766).

2¹²⁹²⁰⁰ is an apocalyptic number.

129200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172980).

129200 is an abundant number, since it is smaller than the sum of its proper divisors (216760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129200 is a wasteful number, since it uses less digits than its factorization.

129200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 129200 is about 359.4440151122. Note that the first 3 decimals coincide. The cubic root of 129200 is about 50.5538425178.

The spelling of 129200 in words is "one hundred twenty-nine thousand, two hundred".