12120813 has 16 divisors (see below), whose sum is σ = 19013760. Its totient is φ = 7604928.

The previous prime is 12120781. The next prime is 12120833. The reversal of 12120813 is 31802121.

12120813 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12120813 - 2⁵ = 12120781 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12745 + ... + 13662.

It is an arithmetic number, because the mean of its divisors is an integer number (1188360).

Almost surely, 2^12120813 is an apocalyptic number.

It is an amenable number.

12120813 is a deficient number, since it is larger than the sum of its proper divisors (6892947).

12120813 is a wasteful number, since it uses less digits than its factorization.

12120813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26433 (or 26427 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12120813 is about 3481.4957992219. The cubic root of 12120813 is about 229.7085975623.

Adding to 12120813 its reverse (31802121), we get a palindrome (43922934).

The spelling of 12120813 in words is "twelve million, one hundred twenty thousand, eight hundred thirteen".