12281656 has 16 divisors (see below), whose sum is σ = 23320800. Its totient is φ = 6062784.

The previous prime is 12281641. The next prime is 12281671. The reversal of 12281656 is 65618221.

It is an interprime number because it is at equal distance from previous prime (12281641) and next prime (12281671).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9085 + ... + 10348.

It is an arithmetic number, because the mean of its divisors is an integer number (1457550).

Almost surely, 2^12281656 is an apocalyptic number.

It is an amenable number.

12281656 is a deficient number, since it is larger than the sum of its proper divisors (11039144).

12281656 is a wasteful number, since it uses less digits than its factorization.

12281656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19518 (or 19514 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 12281656 is about 3504.5193679020. The cubic root of 12281656 is about 230.7202124718.

Adding to 12281656 its reverse (65618221), we get a palindrome (77899877).

The spelling of 12281656 in words is "twelve million, two hundred eighty-one thousand, six hundred fifty-six".