129105018 has 48 divisors (see below), whose sum is σ = 330011136. Its totient is φ = 35696160.

The previous prime is 129105001. The next prime is 129105043. The reversal of 129105018 is 810501921.

It is a junction number, because it is equal to n+sod(n) for n = 129104982 and 129105000.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12621 + ... + 20432.

It is an arithmetic number, because the mean of its divisors is an integer number (6875232).

Almost surely, 2^129105018 is an apocalyptic number.

129105018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129105018 is an abundant number, since it is smaller than the sum of its proper divisors (200906118).

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

129105018 is a wasteful number, since it uses less digits than its factorization.

129105018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33099 (or 33096 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 129105018 is about 11362.4389107269. The cubic root of 129105018 is about 505.4145118079.

Adding to 129105018 its reverse (810501921), we get a palindrome (939606939).

The spelling of 129105018 in words is "one hundred twenty-nine million, one hundred five thousand, eighteen".