12640223 has 4 divisors (see below), whose sum is σ = 12685488. Its totient is φ = 12594960.

The previous prime is 12640217. The next prime is 12640241. The reversal of 12640223 is 32204621.

12640223 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12640223 - 2⁴ = 12640207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12640195 and 12640204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640283) 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, 22211 + ... + 22772.

It is an arithmetic number, because the mean of its divisors is an integer number (3171372).

Almost surely, 2^12640223 is an apocalyptic number.

12640223 is a deficient number, since it is larger than the sum of its proper divisors (45265).

12640223 is an equidigital number, since it uses as much as digits as its factorization.

12640223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45264.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 12640223 is about 3555.3091286132. The cubic root of 12640223 is about 232.9440267839.

Adding to 12640223 its reverse (32204621), we get a palindrome (44844844).

The spelling of 12640223 in words is "twelve million, six hundred forty thousand, two hundred twenty-three".