12201656 has 8 divisors (see below), whose sum is σ = 22878120. Its totient is φ = 6100824.

The previous prime is 12201643. The next prime is 12201659. The reversal of 12201656 is 65610221.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201659) 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, 762596 + ... + 762611.

It is an arithmetic number, because the mean of its divisors is an integer number (2859765).

Almost surely, 2^12201656 is an apocalyptic number.

It is an amenable number.

12201656 is a deficient number, since it is larger than the sum of its proper divisors (10676464).

12201656 is a wasteful number, since it uses less digits than its factorization.

12201656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525213 (or 1525209 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12201656 is about 3493.0868869812. The cubic root of 12201656 is about 230.2181672824.

Adding to 12201656 its reverse (65610221), we get a palindrome (77811877).

The spelling of 12201656 in words is "twelve million, two hundred one thousand, six hundred fifty-six".