12509705 has 16 divisors (see below), whose sum is σ = 17118864. Its totient is φ = 8693760.

The previous prime is 12509699. The next prime is 12509713. The reversal of 12509705 is 50790521.

12509705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1646089 + 10863616 = 1283^2 + 3296^2 .

It is not a de Polignac number, because 12509705 - 2⁶ = 12509641 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4556 + ... + 6765.

It is an arithmetic number, because the mean of its divisors is an integer number (1069929).

Almost surely, 2^12509705 is an apocalyptic number.

It is an amenable number.

12509705 is a deficient number, since it is larger than the sum of its proper divisors (4609159).

12509705 is a wasteful number, since it uses less digits than its factorization.

12509705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11356.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 12509705 is about 3536.9061338973. The cubic root of 12509705 is about 232.1394883028.

The spelling of 12509705 in words is "twelve million, five hundred nine thousand, seven hundred five".