129725205 has 8 divisors (see below), whose sum is σ = 207560352. Its totient is φ = 69186768.

The previous prime is 129725203. The next prime is 129725213. The reversal of 129725205 is 502527921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129725205 - 2¹ = 129725203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129725203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4324159 + ... + 4324188.

It is an arithmetic number, because the mean of its divisors is an integer number (25945044).

Almost surely, 2^129725205 is an apocalyptic number.

129725205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129725205 is a deficient number, since it is larger than the sum of its proper divisors (77835147).

129725205 is an equidigital number, since it uses as much as digits as its factorization.

129725205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8648355.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 129725205 is about 11389.6973181907. The cubic root of 129725205 is about 506.2225127585. Note that the first 3 decimals are identical.

The spelling of 129725205 in words is "one hundred twenty-nine million, seven hundred twenty-five thousand, two hundred five".