13440220 has 48 divisors (see below), whose sum is σ = 30068640. Its totient is φ = 5031936.

The previous prime is 13440199. The next prime is 13440221. The reversal of 13440220 is 2204431.

13440220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 13440194 and 13440203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42784 + ... + 43096.

It is an arithmetic number, because the mean of its divisors is an integer number (626430).

Almost surely, 2^13440220 is an apocalyptic number.

13440220 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 13440220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15034320).

13440220 is an abundant number, since it is smaller than the sum of its proper divisors (16628420).

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

13440220 is a wasteful number, since it uses less digits than its factorization.

13440220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 452 counting only the distinct ones).

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

The square root of 13440220 is about 3666.0905608018. The cubic root of 13440220 is about 237.7581753880.

Adding to 13440220 its reverse (2204431), we get a palindrome (15644651).

The spelling of 13440220 in words is "thirteen million, four hundred forty thousand, two hundred twenty".