12209865 has 8 divisors (see below), whose sum is σ = 19535808. Its totient is φ = 6511920.

The previous prime is 12209861. The next prime is 12209867. The reversal of 12209865 is 56890221.

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

It is not a de Polignac number, because 12209865 - 2² = 12209861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12209861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406981 + ... + 407010.

It is an arithmetic number, because the mean of its divisors is an integer number (2441976).

Almost surely, 2^12209865 is an apocalyptic number.

12209865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12209865 is a deficient number, since it is larger than the sum of its proper divisors (7325943).

12209865 is an equidigital number, since it uses as much as digits as its factorization.

12209865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813999.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 12209865 is about 3494.2617245993. The cubic root of 12209865 is about 230.2697842453.

The spelling of 12209865 in words is "twelve million, two hundred nine thousand, eight hundred sixty-five".