13220440 has 32 divisors (see below), whose sum is σ = 30196080. Its totient is φ = 5208192.

The previous prime is 13220437. The next prime is 13220461. The reversal of 13220440 is 4402231.

13220440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214 + ... + 5146.

Almost surely, 2^13220440 is an apocalyptic number.

13220440 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 13220440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15098040).

13220440 is an abundant number, since it is smaller than the sum of its proper divisors (16975640).

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

13220440 is a wasteful number, since it uses less digits than its factorization.

13220440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011 (or 5007 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 13220440 is about 3635.9922992218. The cubic root of 13220440 is about 236.4550732838.

Adding to 13220440 its reverse (4402231), we get a palindrome (17622671).

The spelling of 13220440 in words is "thirteen million, two hundred twenty thousand, four hundred forty".