129856500 has 96 divisors (see below), whose sum is σ = 420201600. Its totient is φ = 34624800.

The previous prime is 129856499. The next prime is 129856541. The reversal of 129856500 is 5658921.

It is a happy number.

129856500 is a `hidden beast` number, since 1 + 2 + 98 + 565 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8691 + ... + 18309.

It is an arithmetic number, because the mean of its divisors is an integer number (4377100).

Almost surely, 2^129856500 is an apocalyptic number.

129856500 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 129856500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210100800).

129856500 is an abundant number, since it is smaller than the sum of its proper divisors (290345100).

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

129856500 is a wasteful number, since it uses less digits than its factorization.

129856500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9647 (or 9629 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 129856500 is about 11395.4596221478. The cubic root of 129856500 is about 506.3932379322.

The spelling of 129856500 in words is "one hundred twenty-nine million, eight hundred fifty-six thousand, five hundred".