12217865 has 16 divisors (see below), whose sum is σ = 16091136. Its totient is φ = 8832000.

The previous prime is 12217861. The next prime is 12217867. The reversal of 12217865 is 56871221.

12217865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12217865 - 2² = 12217861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12217861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10040 + ... + 11190.

It is an arithmetic number, because the mean of its divisors is an integer number (1005696).

Almost surely, 2^12217865 is an apocalyptic number.

It is an amenable number.

12217865 is a deficient number, since it is larger than the sum of its proper divisors (3873271).

12217865 is a wasteful number, since it uses less digits than its factorization.

12217865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360.

The product of its digits is 6720, while the sum is 32.

The square root of 12217865 is about 3495.4062710935. The cubic root of 12217865 is about 230.3200647927.

The spelling of 12217865 in words is "twelve million, two hundred seventeen thousand, eight hundred sixty-five".