12138724 has 12 divisors (see below), whose sum is σ = 22876924. Its totient is φ = 5602464.

The previous prime is 12138713. The next prime is 12138727. The reversal of 12138724 is 42783121.

12138724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2102500 + 10036224 = 1450^2 + 3168^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12138692 and 12138701.

It is not an unprimeable number, because it can be changed into a prime (12138727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116667 + ... + 116770.

Almost surely, 2^12138724 is an apocalyptic number.

It is an amenable number.

12138724 is a deficient number, since it is larger than the sum of its proper divisors (10738200).

12138724 is a wasteful number, since it uses less digits than its factorization.

12138724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233454 (or 233452 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 12138724 is about 3484.0671635317. The cubic root of 12138724 is about 229.8216891448.

The spelling of 12138724 in words is "twelve million, one hundred thirty-eight thousand, seven hundred twenty-four".