129420000 has 180 divisors, whose sum is σ = 460540080. Its totient is φ = 34464000.

The previous prime is 129419989. The next prime is 129420041. The reversal of 129420000 is 24921.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 179641 + ... + 180359.

It is an arithmetic number, because the mean of its divisors is an integer number (2558556).

Almost surely, 2^129420000 is an apocalyptic number.

129420000 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 129420000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230270040).

129420000 is an abundant number, since it is smaller than the sum of its proper divisors (331120080).

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

129420000 is an equidigital number, since it uses as much as digits as its factorization.

129420000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 129420000 is about 11376.2911355151. The cubic root of 129420000 is about 505.8252037797.

Adding to 129420000 its reverse (24921), we get a palindrome (129444921).

The spelling of 129420000 in words is "one hundred twenty-nine million, four hundred twenty thousand".