129400 has 24 divisors (see below), whose sum is σ = 301320. Its totient is φ = 51680.

The previous prime is 129379. The next prime is 129401. The reversal of 129400 is 4921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129401) by changing a digit.

129400 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 124 + ... + 523.

It is an arithmetic number, because the mean of its divisors is an integer number (12555).

2¹²⁹⁴⁰⁰ is an apocalyptic number.

129400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129400 is an abundant number, since it is smaller than the sum of its proper divisors (171920).

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

129400 is a wasteful number, since it uses less digits than its factorization.

129400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 129400 is about 359.7221149721. The cubic root of 129400 is about 50.5799146433.

It can be divided in two parts, 129 and 400, that added together give a square (529 = 23²).

The spelling of 129400 in words is "one hundred twenty-nine thousand, four hundred".