12440220 has 96 divisors (see below), whose sum is σ = 38525760. Its totient is φ = 2979840.

The previous prime is 12440203. The next prime is 12440221. The reversal of 12440220 is 2204421.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12440220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31786 + ... + 32174.

It is an arithmetic number, because the mean of its divisors is an integer number (401310).

Almost surely, 2^12440220 is an apocalyptic number.

12440220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12440220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19262880).

12440220 is an abundant number, since it is smaller than the sum of its proper divisors (26085540).

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

12440220 is a wasteful number, since it uses less digits than its factorization.

12440220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 12440220 is about 3527.0696052105. The cubic root of 12440220 is about 231.7088847602.

Adding to 12440220 its reverse (2204421), we get a palindrome (14644641).

The spelling of 12440220 in words is "twelve million, four hundred forty thousand, two hundred twenty".