13217520 has 40 divisors (see below), whose sum is σ = 40975056. Its totient is φ = 3524608.

The previous prime is 13217513. The next prime is 13217531. The reversal of 13217520 is 2571231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27297 + ... + 27776.

Almost surely, 2^13217520 is an apocalyptic number.

13217520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13217520 is an abundant number, since it is smaller than the sum of its proper divisors (27757536).

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

13217520 is a wasteful number, since it uses less digits than its factorization.

13217520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55089 (or 55083 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 13217520 is about 3635.5907360428. The cubic root of 13217520 is about 236.4376633828.

Adding to 13217520 its reverse (2571231), we get a palindrome (15788751).

The spelling of 13217520 in words is "thirteen million, two hundred seventeen thousand, five hundred twenty".