129175040 has 40 divisors (see below), whose sum is σ = 309723480. Its totient is φ = 51668992.

The previous prime is 129174973. The next prime is 129175049. The reversal of 129175040 is 40571921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 129174994 and 129175012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129175049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22670 + ... + 27789.

It is an arithmetic number, because the mean of its divisors is an integer number (7743087).

Almost surely, 2^129175040 is an apocalyptic number.

129175040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129175040 is an abundant number, since it is smaller than the sum of its proper divisors (180548440).

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

129175040 is an frugal number, since it uses more digits than its factorization.

129175040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50482 (or 50466 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 129175040 is about 11365.5197857379. The cubic root of 129175040 is about 505.5058682847.

The spelling of 129175040 in words is "one hundred twenty-nine million, one hundred seventy-five thousand, forty".