12161856 has 56 divisors (see below), whose sum is σ = 36779200. Its totient is φ = 3474432.

The previous prime is 12161839. The next prime is 12161867. The reversal of 12161856 is 65816121.

It is a tau number, because it is divible by the number of its divisors (56).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3181 + ... + 5868.

Almost surely, 2^12161856 is an apocalyptic number.

12161856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12161856 is an abundant number, since it is smaller than the sum of its proper divisors (24617344).

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

12161856 is an equidigital number, since it uses as much as digits as its factorization.

12161856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9071 (or 9061 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 12161856 is about 3487.3852669299. The cubic root of 12161856 is about 229.9675820725.

Adding to 12161856 its reverse (65816121), we get a palindrome (77977977).

The spelling of 12161856 in words is "twelve million, one hundred sixty-one thousand, eight hundred fifty-six".