12213747 has 40 divisors (see below), whose sum is σ = 22469216. Its totient is φ = 6438528.

The previous prime is 12213739. The next prime is 12213779. The reversal of 12213747 is 74731221.

It is a happy number.

12213747 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 12213747 - 2³ = 12213739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 12213747.

It is not an unprimeable number, because it can be changed into a prime (12213787) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6543 + ... + 8199.

Almost surely, 2^12213747 is an apocalyptic number.

12213747 is a deficient number, since it is larger than the sum of its proper divisors (10255469).

12213747 is a wasteful number, since it uses less digits than its factorization.

12213747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689 (or 1680 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 12213747 is about 3494.8171625995. The cubic root of 12213747 is about 230.2941856230.

Adding to 12213747 its reverse (74731221), we get a palindrome (86944968).

The spelling of 12213747 in words is "twelve million, two hundred thirteen thousand, seven hundred forty-seven".