13509744 has 40 divisors (see below), whose sum is σ = 35331072. Its totient is φ = 4447680.

The previous prime is 13509689. The next prime is 13509757. The reversal of 13509744 is 44790531.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2289 + ... + 5679.

Almost surely, 2^13509744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13509744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17665536).

13509744 is an abundant number, since it is smaller than the sum of its proper divisors (21821328).

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

13509744 is a wasteful number, since it uses less digits than its factorization.

13509744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485 (or 3479 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 13509744 is about 3675.5603654409. The cubic root of 13509744 is about 238.1674315580.

The spelling of 13509744 in words is "thirteen million, five hundred nine thousand, seven hundred forty-four".