12181028 has 6 divisors (see below), whose sum is σ = 21316806. Its totient is φ = 6090512.

The previous prime is 12180983. The next prime is 12181031. The reversal of 12181028 is 82018121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12166144 + 14884 = 3488^2 + 122^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12180994 and 12181012.

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 as a sum of consecutive naturals, namely, 1522625 + ... + 1522632.

It is an arithmetic number, because the mean of its divisors is an integer number (3552801).

Almost surely, 2^12181028 is an apocalyptic number.

It is an amenable number.

12181028 is a deficient number, since it is larger than the sum of its proper divisors (9135778).

12181028 is a wasteful number, since it uses less digits than its factorization.

12181028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045261 (or 3045259 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 12181028 is about 3490.1329487571. The cubic root of 12181028 is about 230.0883592453.

Adding to 12181028 its reverse (82018121), we get a palindrome (94199149).

The spelling of 12181028 in words is "twelve million, one hundred eighty-one thousand, twenty-eight".