129855705 has 32 divisors (see below), whose sum is σ = 239775744. Its totient is φ = 58781376.

The previous prime is 129855667. The next prime is 129855721. The reversal of 129855705 is 507558921.

It is not a de Polignac number, because 129855705 - 2⁸ = 129855449 is a prime.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 4812 + ... + 16818.

It is an arithmetic number, because the mean of its divisors is an integer number (7492992).

Almost surely, 2^129855705 is an apocalyptic number.

129855705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129855705 is a deficient number, since it is larger than the sum of its proper divisors (109920039).

129855705 is a wasteful number, since it uses less digits than its factorization.

129855705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12125.

The product of its (nonzero) digits is 126000, while the sum is 42.

The square root of 129855705 is about 11395.4247397804. The cubic root of 129855705 is about 506.3922045262.

The spelling of 129855705 in words is "one hundred twenty-nine million, eight hundred fifty-five thousand, seven hundred five".