12685138 has 8 divisors (see below), whose sum is σ = 19641600. Its totient is φ = 6137940.

The previous prime is 12685097. The next prime is 12685163. The reversal of 12685138 is 83158621.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 102238 + ... + 102361.

It is an arithmetic number, because the mean of its divisors is an integer number (2455200).

Almost surely, 2^12685138 is an apocalyptic number.

12685138 is a deficient number, since it is larger than the sum of its proper divisors (6956462).

12685138 is a wasteful number, since it uses less digits than its factorization.

12685138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204632.

The product of its digits is 11520, while the sum is 34.

The square root of 12685138 is about 3561.6201369601. The cubic root of 12685138 is about 233.2196103418.

It can be divided in two parts, 126 and 85138, that added together give a square (85264 = 292²).

The spelling of 12685138 in words is "twelve million, six hundred eighty-five thousand, one hundred thirty-eight".