12689605 has 8 divisors (see below), whose sum is σ = 15255072. Its totient is φ = 10133328.

The previous prime is 12689603. The next prime is 12689609. The reversal of 12689605 is 50698621.

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 12689605 - 2¹ = 12689603 is a prime.

It is a super-2 number, since 2×12689605² = 322052150112050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689603) 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, 1242 + ... + 5188.

It is an arithmetic number, because the mean of its divisors is an integer number (1906884).

Almost surely, 2^12689605 is an apocalyptic number.

It is an amenable number.

12689605 is a deficient number, since it is larger than the sum of its proper divisors (2565467).

12689605 is an equidigital number, since it uses as much as digits as its factorization.

12689605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 12689605 is about 3562.2471840118. The cubic root of 12689605 is about 233.2469827871.

The spelling of 12689605 in words is "twelve million, six hundred eighty-nine thousand, six hundred five".