13515440 has 20 divisors (see below), whose sum is σ = 31423584. Its totient is φ = 5406144.

The previous prime is 13515427. The next prime is 13515449. The reversal of 13515440 is 4451531.

13515440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (13515449) 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, 84392 + ... + 84551.

Almost surely, 2^13515440 is an apocalyptic number.

13515440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13515440 is an abundant number, since it is smaller than the sum of its proper divisors (17908144).

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

13515440 is a wasteful number, since it uses less digits than its factorization.

13515440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168956 (or 168950 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 13515440 is about 3676.3351316223. The cubic root of 13515440 is about 238.2008990334.

Adding to 13515440 its reverse (4451531), we get a palindrome (17966971).

The spelling of 13515440 in words is "thirteen million, five hundred fifteen thousand, four hundred forty".