12217765 has 8 divisors (see below), whose sum is σ = 16755840. Its totient is φ = 8377872.

The previous prime is 12217759. The next prime is 12217769. The reversal of 12217765 is 56771221.

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 12217765 - 2⁷ = 12217637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12217769) 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, 174505 + ... + 174574.

It is an arithmetic number, because the mean of its divisors is an integer number (2094480).

Almost surely, 2^12217765 is an apocalyptic number.

It is an amenable number.

12217765 is a deficient number, since it is larger than the sum of its proper divisors (4538075).

12217765 is an equidigital number, since it uses as much as digits as its factorization.

12217765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349091.

The product of its digits is 5880, while the sum is 31.

The square root of 12217765 is about 3495.3919665754. The cubic root of 12217765 is about 230.3194364213.

Adding to 12217765 its reverse (56771221), we get a palindrome (68988986).

The spelling of 12217765 in words is "twelve million, two hundred seventeen thousand, seven hundred sixty-five".