12212440 has 32 divisors (see below), whose sum is σ = 28926000. Its totient is φ = 4627584.

The previous prime is 12212429. The next prime is 12212441. The reversal of 12212440 is 4421221.

12212440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7275 + ... + 8794.

Almost surely, 2^12212440 is an apocalyptic number.

12212440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212440 is an abundant number, since it is smaller than the sum of its proper divisors (16713560).

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

12212440 is a wasteful number, since it uses less digits than its factorization.

12212440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16099 (or 16095 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 12212440 is about 3494.6301664125. The cubic root of 12212440 is about 230.2859706928.

Adding to 12212440 its reverse (4421221), we get a palindrome (16633661).

The spelling of 12212440 in words is "twelve million, two hundred twelve thousand, four hundred forty".