129135630 has 64 divisors (see below), whose sum is σ = 335301120. Its totient is φ = 31641216.

The previous prime is 129135623. The next prime is 129135631. The reversal of 129135630 is 36531921.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129135631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101941 + ... + 103199.

It is an arithmetic number, because the mean of its divisors is an integer number (5239080).

Almost surely, 2^129135630 is an apocalyptic number.

129135630 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 129135630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167650560).

129135630 is an abundant number, since it is smaller than the sum of its proper divisors (206165490).

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

129135630 is a wasteful number, since it uses less digits than its factorization.

129135630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 129135630 is about 11363.7859008343. The cubic root of 129135630 is about 505.4544548109.

The spelling of 129135630 in words is "one hundred twenty-nine million, one hundred thirty-five thousand, six hundred thirty".