12213440 has 28 divisors (see below), whose sum is σ = 29084016. Its totient is φ = 4885248.

The previous prime is 12213403. The next prime is 12213469. The reversal of 12213440 is 4431221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18764 + ... + 19403.

Almost surely, 2^12213440 is an apocalyptic number.

12213440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12213440 is an abundant number, since it is smaller than the sum of its proper divisors (16870576).

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

12213440 is an equidigital number, since it uses as much as digits as its factorization.

12213440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38184 (or 38174 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12213440 is about 3494.7732401402. The cubic root of 12213440 is about 230.2922560784.

Adding to 12213440 its reverse (4431221), we get a palindrome (16644661).

The spelling of 12213440 in words is "twelve million, two hundred thirteen thousand, four hundred forty".