129830 has 8 divisors (see below), whose sum is σ = 233712. Its totient is φ = 51928.

The previous prime is 129803. The next prime is 129841. The reversal of 129830 is 38921.

129830 = T₁₂₄ + T₁₂₅ + ... + T₁₃₈.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 129796 and 129805.

It is a congruent number.

It is an unprimeable number.

129830 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 3 ways as a sum of consecutive naturals, for example, 6482 + ... + 6501.

It is an arithmetic number, because the mean of its divisors is an integer number (29214).

2¹²⁹⁸³⁰ is an apocalyptic number.

129830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129830 is a deficient number, since it is larger than the sum of its proper divisors (103882).

129830 is a wasteful number, since it uses less digits than its factorization.

129830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12990.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 129830 is about 360.3193028412. The cubic root of 129830 is about 50.6358788793.

Subtracting from 129830 its reverse (38921), we obtain a palindrome (90909).

It can be divided in two parts, 129 and 830, that added together give a palindrome (959).

The spelling of 129830 in words is "one hundred twenty-nine thousand, eight hundred thirty".