129180 has 24 divisors (see below), whose sum is σ = 361872. Its totient is φ = 34432.

The previous prime is 129169. The next prime is 129187. The reversal of 129180 is 81921.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129187) by changing a digit.

129180 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1017 + ... + 1136.

It is an arithmetic number, because the mean of its divisors is an integer number (15078).

2¹²⁹¹⁸⁰ is an apocalyptic number.

129180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129180 is an abundant number, since it is smaller than the sum of its proper divisors (232692).

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

129180 is a wasteful number, since it uses less digits than its factorization.

129180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165 (or 2163 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 129180 is about 359.4161932913. The cubic root of 129180 is about 50.5512338258.

It can be divided in two parts, 129 and 180, that multiplied together give a triangular number (23220 = T₂₁₅).

The spelling of 129180 in words is "one hundred twenty-nine thousand, one hundred eighty".