12120636 has 24 divisors (see below), whose sum is σ = 30852864. Its totient is φ = 3672880.

The previous prime is 12120631. The next prime is 12120649. The reversal of 12120636 is 63602121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120631) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 45780 + ... + 46043.

It is an arithmetic number, because the mean of its divisors is an integer number (1285536).

Almost surely, 2^12120636 is an apocalyptic number.

It is an amenable number.

12120636 is an abundant number, since it is smaller than the sum of its proper divisors (18732228).

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

12120636 is a wasteful number, since it uses less digits than its factorization.

12120636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91841 (or 91839 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 12120636 is about 3481.4703790209. The cubic root of 12120636 is about 229.7074794134.

Adding to 12120636 its reverse (63602121), we get a palindrome (75722757).

The spelling of 12120636 in words is "twelve million, one hundred twenty thousand, six hundred thirty-six".