12171648 has 64 divisors (see below), whose sum is σ = 33476400. Its totient is φ = 3913728.

The previous prime is 12171617. The next prime is 12171659. The reversal of 12171648 is 84617121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10590 + ... + 11682.

Almost surely, 2^12171648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12171648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16738200).

12171648 is an abundant number, since it is smaller than the sum of its proper divisors (21304752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12171648 is a wasteful number, since it uses less digits than its factorization.

12171648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1127 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 12171648 is about 3488.7889016104. The cubic root of 12171648 is about 230.0292842360.

Adding to 12171648 its reverse (84617121), we get a palindrome (96788769).

The spelling of 12171648 in words is "twelve million, one hundred seventy-one thousand, six hundred forty-eight".