12217979 has 6 divisors (see below), whose sum is σ = 12485724. Its totient is φ = 11955860.

The previous prime is 12217957. The next prime is 12217987. The reversal of 12217979 is 97971221.

It is not a de Polignac number, because 12217979 - 2¹⁶ = 12152443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12217939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 557 + ... + 4974.

It is an arithmetic number, because the mean of its divisors is an integer number (2080954).

Almost surely, 2^12217979 is an apocalyptic number.

12217979 is a deficient number, since it is larger than the sum of its proper divisors (267745).

12217979 is an frugal number, since it uses more digits than its factorization.

12217979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5625 (or 5578 counting only the distinct ones).

The product of its digits is 15876, while the sum is 38.

The square root of 12217979 is about 3495.4225781728. The cubic root of 12217979 is about 230.3207811318.

The spelling of 12217979 in words is "twelve million, two hundred seventeen thousand, nine hundred seventy-nine".