129976530 has 64 divisors (see below), whose sum is σ = 336061440. Its totient is φ = 32066496.

The previous prime is 129976513. The next prime is 129976559. The reversal of 129976530 is 35679921.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21859 + ... + 27161.

It is an arithmetic number, because the mean of its divisors is an integer number (5250960).

Almost surely, 2^129976530 is an apocalyptic number.

129976530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129976530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168030720).

129976530 is an abundant number, since it is smaller than the sum of its proper divisors (206084910).

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

129976530 is a wasteful number, since it uses less digits than its factorization.

129976530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 129976530 is about 11400.7249769477. The cubic root of 129976530 is about 506.5492143686.

The spelling of 129976530 in words is "one hundred twenty-nine million, nine hundred seventy-six thousand, five hundred thirty".