13659909 has 4 divisors (see below), whose sum is σ = 18213216. Its totient is φ = 9106604.

The previous prime is 13659901. The next prime is 13659911. The reversal of 13659909 is 90995631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90995631 = 3 ⋅30331877.

It is a cyclic number.

It is not a de Polignac number, because 13659909 - 2³ = 13659901 is a prime.

It is a super-2 number, since 2×13659909² = 373186227776562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13659901) 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, 2276649 + ... + 2276654.

It is an arithmetic number, because the mean of its divisors is an integer number (4553304).

Almost surely, 2^13659909 is an apocalyptic number.

It is an amenable number.

13659909 is a deficient number, since it is larger than the sum of its proper divisors (4553307).

13659909 is an equidigital number, since it uses as much as digits as its factorization.

13659909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553306.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 13659909 is about 3695.9314117013. The cubic root of 13659909 is about 239.0466170746.

The spelling of 13659909 in words is "thirteen million, six hundred fifty-nine thousand, nine hundred nine".