129030000 has 400 divisors, whose sum is σ = 502039296. Its totient is φ = 28160000.

The previous prime is 129029987. The next prime is 129030001. The reversal of 129030000 is 30921.

It is a tau number, because it is divible by the number of its divisors (400).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129030001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5609989 + ... + 5610011.

Almost surely, 2^129030000 is an apocalyptic number.

129030000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129030000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251019648).

129030000 is an abundant number, since it is smaller than the sum of its proper divisors (373009296).

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

129030000 is a wasteful number, since it uses less digits than its factorization.

129030000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 129030000 is about 11359.1372911855. The cubic root of 129030000 is about 505.3166004783.

Adding to 129030000 its reverse (30921), we get a palindrome (129060921).

The spelling of 129030000 in words is "one hundred twenty-nine million, thirty thousand".