13521040 has 40 divisors (see below), whose sum is σ = 33857208. Its totient is φ = 4992000.

The previous prime is 13521031. The next prime is 13521043. The reversal of 13521040 is 4012531.

It can be written as a sum of positive squares in 4 ways, for example, as 589824 + 12931216 = 768^2 + 3596^2 .

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

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (13521043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5461 + ... + 7540.

Almost surely, 2^13521040 is an apocalyptic number.

13521040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13521040 is an abundant number, since it is smaller than the sum of its proper divisors (20336168).

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

13521040 is a wasteful number, since it uses less digits than its factorization.

13521040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13027 (or 13021 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 13521040 is about 3677.0966808067. The cubic root of 13521040 is about 238.2337932848.

Adding to 13521040 its reverse (4012531), we get a palindrome (17533571).

The spelling of 13521040 in words is "thirteen million, five hundred twenty-one thousand, forty".