129135380 has 24 divisors (see below), whose sum is σ = 295837920. Its totient is φ = 46958240.

The previous prime is 129135379. The next prime is 129135389. The reversal of 129135380 is 83531921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129135389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293270 + ... + 293709.

It is an arithmetic number, because the mean of its divisors is an integer number (12326580).

Almost surely, 2^129135380 is an apocalyptic number.

129135380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129135380 is an abundant number, since it is smaller than the sum of its proper divisors (166702540).

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

129135380 is a wasteful number, since it uses less digits than its factorization.

129135380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586999 (or 586997 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 129135380 is about 11363.7749009737. The cubic root of 129135380 is about 505.4541286327.

The spelling of 129135380 in words is "one hundred twenty-nine million, one hundred thirty-five thousand, three hundred eighty".