13720040 has 32 divisors (see below), whose sum is σ = 31311360. Its totient is φ = 5409600.

The previous prime is 13720039. The next prime is 13720061. The reversal of 13720040 is 4002731.

It is a happy number.

13720040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 425 + ... + 5255.

It is an arithmetic number, because the mean of its divisors is an integer number (978480).

Almost surely, 2^13720040 is an apocalyptic number.

13720040 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 13720040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15655680).

13720040 is an abundant number, since it is smaller than the sum of its proper divisors (17591320).

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

13720040 is a wasteful number, since it uses less digits than its factorization.

13720040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4913 (or 4909 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 13720040 is about 3704.0572349790. The cubic root of 13720040 is about 239.3968651843.

Adding to 13720040 its reverse (4002731), we get a palindrome (17722771).

The spelling of 13720040 in words is "thirteen million, seven hundred twenty thousand, forty".