12217973 has 4 divisors (see below), whose sum is σ = 12225708. Its totient is φ = 12210240.

The previous prime is 12217957. The next prime is 12217987. The reversal of 12217973 is 37971221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8898289 + 3319684 = 2983^2 + 1822^2 .

It is a cyclic number.

It is not a de Polignac number, because 12217973 - 2⁴ = 12217957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12217913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548 + ... + 4973.

It is an arithmetic number, because the mean of its divisors is an integer number (3056427).

Almost surely, 2^12217973 is an apocalyptic number.

It is an amenable number.

12217973 is a deficient number, since it is larger than the sum of its proper divisors (7735).

12217973 is an equidigital number, since it uses as much as digits as its factorization.

12217973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7734.

The product of its digits is 5292, while the sum is 32.

The square root of 12217973 is about 3495.4217199073. The cubic root of 12217973 is about 230.3207434299.

The spelling of 12217973 in words is "twelve million, two hundred seventeen thousand, nine hundred seventy-three".