12161646 has 48 divisors (see below), whose sum is σ = 30311424. Its totient is φ = 3452112.

The previous prime is 12161629. The next prime is 12161651. The reversal of 12161646 is 64616121.

12161646 is a `hidden beast` number, since 1 + 2 + 1 + 616 + 46 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 32955 + ... + 33321.

It is an arithmetic number, because the mean of its divisors is an integer number (631488).

Almost surely, 2^12161646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12161646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15155712).

12161646 is an abundant number, since it is smaller than the sum of its proper divisors (18149778).

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

12161646 is a wasteful number, since it uses less digits than its factorization.

12161646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 642 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 12161646 is about 3487.3551582826. The cubic root of 12161646 is about 229.9662584403.

Adding to 12161646 its reverse (64616121), we get a palindrome (76777767).

The spelling of 12161646 in words is "twelve million, one hundred sixty-one thousand, six hundred forty-six".