129984 has 28 divisors (see below), whose sum is σ = 344424. Its totient is φ = 43264.

The previous prime is 129971. The next prime is 130003. The reversal of 129984 is 489921.

129984 = T₂₉ + T₃₀ + ... + T₉₂.

It is a congruent number.

It is an unprimeable number.

129984 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 3 ways as a sum of consecutive naturals, for example, 147 + ... + 530.

2¹²⁹⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

129984 is an abundant number, since it is smaller than the sum of its proper divisors (214440).

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

129984 is an equidigital number, since it uses as much as digits as its factorization.

129984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 682 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 129984 is about 360.5329388558. The cubic root of 129984 is about 50.6558918300.

The spelling of 129984 in words is "one hundred twenty-nine thousand, nine hundred eighty-four".