129870000 has 400 divisors, whose sum is σ = 515210080. Its totient is φ = 31104000.

The previous prime is 129869969. The next prime is 129870007. The reversal of 129870000 is 78921.

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 (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129870007) 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, 3509982 + ... + 3510018.

Almost surely, 2^129870000 is an apocalyptic number.

129870000 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 129870000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257605040).

129870000 is an abundant number, since it is smaller than the sum of its proper divisors (385340080).

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

129870000 is a wasteful number, since it uses less digits than its factorization.

129870000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 129870000 is about 11396.0519479335. The cubic root of 129870000 is about 506.4107856915.

The spelling of 129870000 in words is "one hundred twenty-nine million, eight hundred seventy thousand".