12681605 has 8 divisors (see below), whose sum is σ = 15358200. Its totient is φ = 10051776.

The previous prime is 12681601. The next prime is 12681619. The reversal of 12681605 is 50618621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1705636 + 10975969 = 1306^2 + 3313^2 .

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 12681605 - 2² = 12681601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11090 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (1919775).

Almost surely, 2^12681605 is an apocalyptic number.

It is an amenable number.

12681605 is a deficient number, since it is larger than the sum of its proper divisors (2676595).

12681605 is a wasteful number, since it uses less digits than its factorization.

12681605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23383.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12681605 is about 3561.1241202744. The cubic root of 12681605 is about 233.1979566189.

The spelling of 12681605 in words is "twelve million, six hundred eighty-one thousand, six hundred five".