12289665 has 8 divisors (see below), whose sum is σ = 19663488. Its totient is φ = 6554480.

The previous prime is 12289639. The next prime is 12289679. The reversal of 12289665 is 56698221.

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

It is not a de Polignac number, because 12289665 - 2¹³ = 12281473 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 409641 + ... + 409670.

It is an arithmetic number, because the mean of its divisors is an integer number (2457936).

Almost surely, 2^12289665 is an apocalyptic number.

12289665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12289665 is a deficient number, since it is larger than the sum of its proper divisors (7373823).

12289665 is an equidigital number, since it uses as much as digits as its factorization.

12289665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819319.

The product of its digits is 51840, while the sum is 39.

The square root of 12289665 is about 3505.6618490664. The cubic root of 12289665 is about 230.7703532851.

The spelling of 12289665 in words is "twelve million, two hundred eighty-nine thousand, six hundred sixty-five".