129785124 has 72 divisors (see below), whose sum is σ = 370846560. Its totient is φ = 35126784.

The previous prime is 129785099. The next prime is 129785129. The reversal of 129785124 is 421587921.

It is not an unprimeable number, because it can be changed into a prime (129785129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5364 + ... + 16980.

Almost surely, 2^129785124 is an apocalyptic number.

129785124 is a gapful number since it is divisible by the number (14) 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 129785124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185423280).

129785124 is an abundant number, since it is smaller than the sum of its proper divisors (241061436).

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

129785124 is a wasteful number, since it uses less digits than its factorization.

129785124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11657 (or 11648 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 129785124 is about 11392.3274180476. The cubic root of 129785124 is about 506.3004407598.

The spelling of 129785124 in words is "one hundred twenty-nine million, seven hundred eighty-five thousand, one hundred twenty-four".