13409520 has 80 divisors (see below), whose sum is σ = 42318720. Its totient is φ = 3511552.

The previous prime is 13409491. The next prime is 13409531. The reversal of 13409520 is 2590431.

13409520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13687 + ... + 14633.

It is an arithmetic number, because the mean of its divisors is an integer number (528984).

Almost surely, 2^13409520 is an apocalyptic number.

13409520 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 13409520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21159360).

13409520 is an abundant number, since it is smaller than the sum of its proper divisors (28909200).

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

13409520 is a wasteful number, since it uses less digits than its factorization.

13409520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 13409520 is about 3661.9011455800. The cubic root of 13409520 is about 237.5770091915.

Adding to 13409520 its reverse (2590431), we get a palindrome (15999951).

The spelling of 13409520 in words is "thirteen million, four hundred nine thousand, five hundred twenty".