129824 has 12 divisors (see below), whose sum is σ = 255654. Its totient is φ = 64896.

The previous prime is 129803. The next prime is 129841. The reversal of 129824 is 428921.

It can be written as a sum of positive squares in only one way, i.e., 110224 + 19600 = 332^2 + 140^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 129793 and 129802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997 + ... + 2060.

2¹²⁹⁸²⁴ is an apocalyptic number.

It is an amenable number.

129824 is a deficient number, since it is larger than the sum of its proper divisors (125830).

129824 is an equidigital number, since it uses as much as digits as its factorization.

129824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067 (or 4059 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 129824 is about 360.3109767964. The cubic root of 129824 is about 50.6350988338.

The spelling of 129824 in words is "one hundred twenty-nine thousand, eight hundred twenty-four".