13257520 has 20 divisors (see below), whose sum is σ = 30823920. Its totient is φ = 5302976.

The previous prime is 13257493. The next prime is 13257521. The reversal of 13257520 is 2575231.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (13257521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82780 + ... + 82939.

It is an arithmetic number, because the mean of its divisors is an integer number (1541196).

Almost surely, 2^13257520 is an apocalyptic number.

13257520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13257520 is an abundant number, since it is smaller than the sum of its proper divisors (17566400).

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

13257520 is a wasteful number, since it uses less digits than its factorization.

13257520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165732 (or 165726 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 13257520 is about 3641.0877495606. The cubic root of 13257520 is about 236.6759325430.

The spelling of 13257520 in words is "thirteen million, two hundred fifty-seven thousand, five hundred twenty".