129018 has 8 divisors (see below), whose sum is σ = 258048. Its totient is φ = 43004.

The previous prime is 129011. The next prime is 129023. The reversal of 129018 is 810921.

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

129018 is an admirable number.

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 = 128985 and 129003.

It is not an unprimeable number, because it can be changed into a prime (129011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10746 + ... + 10757.

It is an arithmetic number, because the mean of its divisors is an integer number (32256).

2¹²⁹⁰¹⁸ is an apocalyptic number.

129018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129018 is a wasteful number, since it uses less digits than its factorization.

129018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21508.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 129018 is about 359.1907571194. The cubic root of 129018 is about 50.5300934904.

Adding to 129018 its reverse (810921), we get a palindrome (939939).

It can be divided in two parts, 1290 and 18, that multiplied together give a triangular number (23220 = T₂₁₅).

The spelling of 129018 in words is "one hundred twenty-nine thousand, eighteen".