129140532 has 18 divisors (see below), whose sum is σ = 326438658. Its totient is φ = 43046832.

The previous prime is 129140497. The next prime is 129140533. The reversal of 129140532 is 235041921.

129140532 is a `hidden beast` number, since 1 + 2 + 91 + 40 + 532 = 666.

It can be written as a sum of positive squares in only one way, i.e., 129140496 + 36 = 11364^2 + 6^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 129140496 and 129140505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129140533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1793583 + ... + 1793654.

It is an arithmetic number, because the mean of its divisors is an integer number (18135481).

Almost surely, 2^129140532 is an apocalyptic number.

129140532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129140532 is an abundant number, since it is smaller than the sum of its proper divisors (197298126).

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

129140532 is a wasteful number, since it uses less digits than its factorization.

129140532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587247 (or 3587242 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 129140532 is about 11364.0015839492. The cubic root of 129140532 is about 505.4608504287.

The spelling of 129140532 in words is "one hundred twenty-nine million, one hundred forty thousand, five hundred thirty-two".