13521380 has 12 divisors (see below), whose sum is σ = 28394940. Its totient is φ = 5408544.

The previous prime is 13521373. The next prime is 13521397. The reversal of 13521380 is 8312531.

13521380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5410276 + 8111104 = 2326^2 + 2848^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338015 + ... + 338054.

It is an arithmetic number, because the mean of its divisors is an integer number (2366245).

Almost surely, 2^13521380 is an apocalyptic number.

13521380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13521380 is an abundant number, since it is smaller than the sum of its proper divisors (14873560).

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

13521380 is a wasteful number, since it uses less digits than its factorization.

13521380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676078 (or 676076 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 13521380 is about 3677.1429126429. The cubic root of 13521380 is about 238.2357901433.

The spelling of 13521380 in words is "thirteen million, five hundred twenty-one thousand, three hundred eighty".