129438825 has 24 divisors (see below), whose sum is σ = 223313088. Its totient is φ = 66031680.

The previous prime is 129438791. The next prime is 129438847. The reversal of 129438825 is 528834921.

It is not a de Polignac number, because 129438825 - 2¹⁴ = 129422441 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35794 + ... + 39243.

It is an arithmetic number, because the mean of its divisors is an integer number (9304712).

Almost surely, 2^129438825 is an apocalyptic number.

129438825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129438825 is a deficient number, since it is larger than the sum of its proper divisors (93874263).

129438825 is a wasteful number, since it uses less digits than its factorization.

129438825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75073 (or 75068 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 129438825 is about 11377.1184840451. The cubic root of 129438825 is about 505.8497278043.

The spelling of 129438825 in words is "one hundred twenty-nine million, four hundred thirty-eight thousand, eight hundred twenty-five".