12226640 has 20 divisors (see below), whose sum is σ = 28427124. Its totient is φ = 4890624.

The previous prime is 12226637. The next prime is 12226649. The reversal of 12226640 is 4662221.

It can be written as a sum of positive squares in 2 ways, for example, as 4631104 + 7595536 = 2152^2 + 2756^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12226649) 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, 76337 + ... + 76496.

Almost surely, 2^12226640 is an apocalyptic number.

12226640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12226640 is an abundant number, since it is smaller than the sum of its proper divisors (16200484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12226640 is a wasteful number, since it uses less digits than its factorization.

12226640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152846 (or 152840 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 12226640 is about 3496.6612646924. The cubic root of 12226640 is about 230.3751910337.

Adding to 12226640 its reverse (4662221), we get a palindrome (16888861).

It can be divided in two parts, 122 and 26640, that added together give a palindrome (26762).

The spelling of 12226640 in words is "twelve million, two hundred twenty-six thousand, six hundred forty".