12685905 has 24 divisors (see below), whose sum is σ = 22749480. Its totient is φ = 6531840.

The previous prime is 12685891. The next prime is 12685919. The reversal of 12685905 is 50958621.

It is a happy number.

12685905 is a `hidden beast` number, since 1 + 2 + 68 + 590 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (12685891) and next prime (12685919).

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 12680721 = 72^2 + 3561^2 .

It is not a de Polignac number, because 12685905 - 2⁴ = 12685889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12685905.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3556 + ... + 6165.

It is an arithmetic number, because the mean of its divisors is an integer number (947895).

Almost surely, 2^12685905 is an apocalyptic number.

12685905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12685905 is a deficient number, since it is larger than the sum of its proper divisors (10063575).

12685905 is a wasteful number, since it uses less digits than its factorization.

12685905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9761 (or 9758 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 12685905 is about 3561.7278110490. The cubic root of 12685905 is about 233.2243107463.

The spelling of 12685905 in words is "twelve million, six hundred eighty-five thousand, nine hundred five".