12217994 has 4 divisors (see below), whose sum is σ = 18326994. Its totient is φ = 6108996.

The previous prime is 12217993. The next prime is 12218027. The reversal of 12217994 is 49971221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11992369 + 225625 = 3463^2 + 475^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12217993) 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 as a sum of consecutive naturals, namely, 3054497 + ... + 3054500.

Almost surely, 2^12217994 is an apocalyptic number.

12217994 is a deficient number, since it is larger than the sum of its proper divisors (6109000).

12217994 is an equidigital number, since it uses as much as digits as its factorization.

12217994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108999.

The product of its digits is 9072, while the sum is 35.

The square root of 12217994 is about 3495.4247238354. The cubic root of 12217994 is about 230.3208753867.

The spelling of 12217994 in words is "twelve million, two hundred seventeen thousand, nine hundred ninety-four".