12811924 has 12 divisors (see below), whose sum is σ = 22446004. Its totient is φ = 6398784.

The previous prime is 12811907. The next prime is 12811927. The reversal of 12811924 is 42911821.

It can be written as a sum of positive squares in 2 ways, for example, as 6400900 + 6411024 = 2530^2 + 2532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12811892 and 12811901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12811927) 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 3 ways as a sum of consecutive naturals, for example, 5662 + ... + 7594.

Almost surely, 2^12811924 is an apocalyptic number.

It is an amenable number.

12811924 is a deficient number, since it is larger than the sum of its proper divisors (9634080).

12811924 is a wasteful number, since it uses less digits than its factorization.

12811924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3594 (or 3592 counting only the distinct ones).

The product of its digits is 1152, while the sum is 28.

The square root of 12811924 is about 3579.3748057447. The cubic root of 12811924 is about 233.9940339872.

The spelling of 12811924 in words is "twelve million, eight hundred eleven thousand, nine hundred twenty-four".