8129705 has 8 divisors (see below), whose sum is σ = 9865800. Its totient is φ = 6430336.

The previous prime is 8129683. The next prime is 8129707. The reversal of 8129705 is 5079218.

It can be written as a sum of positive squares in 4 ways, for example, as 583696 + 7546009 = 764^2 + 2747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8129705 - 2¹⁴ = 8113321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8129707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8690 + ... + 9579.

It is an arithmetic number, because the mean of its divisors is an integer number (1233225).

Almost surely, 2^8129705 is an apocalyptic number.

It is an amenable number.

8129705 is a deficient number, since it is larger than the sum of its proper divisors (1736095).

8129705 is a wasteful number, since it uses less digits than its factorization.

8129705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18363.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 8129705 is about 2851.2637548989. The cubic root of 8129705 is about 201.0750855998.

The spelling of 8129705 in words is "eight million, one hundred twenty-nine thousand, seven hundred five".