12640222 has 8 divisors (see below), whose sum is σ = 21668976. Its totient is φ = 5417232.

The previous prime is 12640217. The next prime is 12640241. The reversal of 12640222 is 22204621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12640222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451423 + ... + 451450.

It is an arithmetic number, because the mean of its divisors is an integer number (2708622).

Almost surely, 2^12640222 is an apocalyptic number.

12640222 is a deficient number, since it is larger than the sum of its proper divisors (9028754).

12640222 is an equidigital number, since it uses as much as digits as its factorization.

12640222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902882.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 12640222 is about 3555.3089879784. The cubic root of 12640222 is about 232.9440206409.

Adding to 12640222 its reverse (22204621), we get a palindrome (34844843).

The spelling of 12640222 in words is "twelve million, six hundred forty thousand, two hundred twenty-two".