129397205 has 16 divisors (see below), whose sum is σ = 177686784. Its totient is φ = 88615680.

The previous prime is 129397153. The next prime is 129397231. The reversal of 129397205 is 502793921.

It is not a de Polignac number, because 129397205 - 2⁶ = 129397141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32525 + ... + 36285.

It is an arithmetic number, because the mean of its divisors is an integer number (11105424).

Almost surely, 2^129397205 is an apocalyptic number.

It is an amenable number.

129397205 is a deficient number, since it is larger than the sum of its proper divisors (48289579).

129397205 is an equidigital number, since it uses as much as digits as its factorization.

129397205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4756.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 129397205 is about 11375.2892270922. The cubic root of 129397205 is about 505.7955047055.

The spelling of 129397205 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, two hundred five".