13809609 has 30 divisors (see below), whose sum is σ = 22691130. Its totient is φ = 8363520.

The previous prime is 13809589. The next prime is 13809611. The reversal of 13809609 is 90690831.

It can be written as a sum of positive squares in only one way, i.e., 7683984 + 6125625 = 2772^2 + 2475^2 .

It is not a de Polignac number, because 13809609 - 2²¹ = 11712457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13809209) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 9097 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (756371).

Almost surely, 2^13809609 is an apocalyptic number.

It is an amenable number.

13809609 is a deficient number, since it is larger than the sum of its proper divisors (8881521).

13809609 is a wasteful number, since it uses less digits than its factorization.

13809609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443 (or 1423 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 13809609 is about 3716.1282270664. The cubic root of 13809609 is about 239.9166898342.

The spelling of 13809609 in words is "thirteen million, eight hundred nine thousand, six hundred nine".