129127905 has 16 divisors (see below), whose sum is σ = 229560960. Its totient is φ = 68868144.

The previous prime is 129127897. The next prime is 129127909. The reversal of 129127905 is 509721921.

It is not a de Polignac number, because 129127905 - 2³ = 129127897 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 129127905.

It is not an unprimeable number, because it can be changed into a prime (129127909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 478117 + ... + 478386.

It is an arithmetic number, because the mean of its divisors is an integer number (14347560).

Almost surely, 2^129127905 is an apocalyptic number.

129127905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129127905 is a deficient number, since it is larger than the sum of its proper divisors (100433055).

129127905 is an equidigital number, since it uses as much as digits as its factorization.

129127905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956517 (or 956511 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 129127905 is about 11363.4460002237. The cubic root of 129127905 is about 505.4443757090. Note that the first 3 decimals are identical.

The spelling of 129127905 in words is "one hundred twenty-nine million, one hundred twenty-seven thousand, nine hundred five".