13215520 has 48 divisors (see below), whose sum is σ = 31485888. Its totient is φ = 5241600.

The previous prime is 13215479. The next prime is 13215533. The reversal of 13215520 is 2551231.

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, 23887 + ... + 24433.

It is an arithmetic number, because the mean of its divisors is an integer number (655956).

Almost surely, 2^13215520 is an apocalyptic number.

13215520 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 13215520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15742944).

13215520 is an abundant number, since it is smaller than the sum of its proper divisors (18270368).

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

13215520 is a wasteful number, since it uses less digits than its factorization.

13215520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 13215520 is about 3635.3156671739. The cubic root of 13215520 is about 236.4257373135.

Adding to 13215520 its reverse (2551231), we get a palindrome (15766751).

The spelling of 13215520 in words is "thirteen million, two hundred fifteen thousand, five hundred twenty".