13509988 has 12 divisors (see below), whose sum is σ = 24886960. Its totient is φ = 6399432.

The previous prime is 13509983. The next prime is 13509989. The reversal of 13509988 is 88990531.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (13509983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88806 + ... + 88957.

Almost surely, 2^13509988 is an apocalyptic number.

It is an amenable number.

13509988 is a deficient number, since it is larger than the sum of its proper divisors (11376972).

13509988 is a wasteful number, since it uses less digits than its factorization.

13509988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177786 (or 177784 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 13509988 is about 3675.5935575088. The cubic root of 13509988 is about 238.1688653997.

The spelling of 13509988 in words is "thirteen million, five hundred nine thousand, nine hundred eighty-eight".