12161776 has 40 divisors (see below), whose sum is σ = 26319744. Its totient is φ = 5396160.

The previous prime is 12161771. The next prime is 12161777. The reversal of 12161776 is 67716121.

12161776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12161771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6765 + ... + 8371.

Almost surely, 2^12161776 is an apocalyptic number.

12161776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12161776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13159872).

12161776 is an abundant number, since it is smaller than the sum of its proper divisors (14157968).

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

12161776 is a wasteful number, since it uses less digits than its factorization.

12161776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669 (or 1663 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The square root of 12161776 is about 3487.3737969997. The cubic root of 12161776 is about 229.9670778334.

Adding to 12161776 its reverse (67716121), we get a palindrome (79877897).

It can be divided in two parts, 1216 and 1776, that added together give a palindrome (2992).

The spelling of 12161776 in words is "twelve million, one hundred sixty-one thousand, seven hundred seventy-six".