129319905 has 32 divisors (see below), whose sum is σ = 243089280. Its totient is φ = 57876480.

The previous prime is 129319859. The next prime is 129319913. The reversal of 129319905 is 509913921.

It is not a de Polignac number, because 129319905 - 2⁸ = 129319649 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28000 + ... + 32289.

It is an arithmetic number, because the mean of its divisors is an integer number (7596540).

Almost surely, 2^129319905 is an apocalyptic number.

129319905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129319905 is a deficient number, since it is larger than the sum of its proper divisors (113769375).

129319905 is a wasteful number, since it uses less digits than its factorization.

129319905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60321.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 129319905 is about 11371.8910036985. The cubic root of 129319905 is about 505.6947663611.

The spelling of 129319905 in words is "one hundred twenty-nine million, three hundred nineteen thousand, nine hundred five".