129828 has 24 divisors (see below), whose sum is σ = 313600. Its totient is φ = 41760.

The previous prime is 129803. The next prime is 129841. The reversal of 129828 is 828921.

It is a junction number, because it is equal to n+sod(n) for n = 129795 and 129804.

It is a congruent number.

It is an unprimeable number.

129828 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, 198 + ... + 546.

2¹²⁹⁸²⁸ is an apocalyptic number.

It is an amenable number.

129828 is an abundant number, since it is smaller than the sum of its proper divisors (183772).

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

129828 is a wasteful number, since it uses less digits than its factorization.

129828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 385 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 129828 is about 360.3165275144. The cubic root of 129828 is about 50.6356188668.

It can be divided in two parts, 1298 and 28, that added together give a triangular number (1326 = T₅₁).

The spelling of 129828 in words is "one hundred twenty-nine thousand, eight hundred twenty-eight".