12217906 has 8 divisors (see below), whose sum is σ = 18918144. Its totient is φ = 5911860.

The previous prime is 12217901. The next prime is 12217913. The reversal of 12217906 is 60971221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12217901) 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 in 3 ways as a sum of consecutive naturals, for example, 98470 + ... + 98593.

It is an arithmetic number, because the mean of its divisors is an integer number (2364768).

Almost surely, 2^12217906 is an apocalyptic number.

12217906 is a deficient number, since it is larger than the sum of its proper divisors (6700238).

12217906 is a wasteful number, since it uses less digits than its factorization.

12217906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197096.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 12217906 is about 3495.4121359290. The cubic root of 12217906 is about 230.3203224239.

The spelling of 12217906 in words is "twelve million, two hundred seventeen thousand, nine hundred six".