129057905 has 16 divisors (see below), whose sum is σ = 156495360. Its totient is φ = 102169728.

The previous prime is 129057811. The next prime is 129057913. The reversal of 129057905 is 509750921.

It is a cyclic number.

It is not a de Polignac number, because 129057905 - 2²⁴ = 112280689 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315341 + ... + 315749.

It is an arithmetic number, because the mean of its divisors is an integer number (9780960).

Almost surely, 2^129057905 is an apocalyptic number.

It is an amenable number.

129057905 is a deficient number, since it is larger than the sum of its proper divisors (27437455).

129057905 is a wasteful number, since it uses less digits than its factorization.

129057905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 129057905 is about 11360.3655310910. The cubic root of 129057905 is about 505.3530257110.

It can be divided in two parts, 1290 and 57905, that added together give a palindrome (59195).

The spelling of 129057905 in words is "one hundred twenty-nine million, fifty-seven thousand, nine hundred five".