13540809 has 8 divisors (see below), whose sum is σ = 18074592. Its totient is φ = 9017120.

The previous prime is 13540801. The next prime is 13540817. The reversal of 13540809 is 90804531.

It is an interprime number because it is at equal distance from previous prime (13540801) and next prime (13540817).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13540809 - 2³ = 13540801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13540801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1549 + ... + 5429.

It is an arithmetic number, because the mean of its divisors is an integer number (2259324).

Almost surely, 2^13540809 is an apocalyptic number.

It is an amenable number.

13540809 is a deficient number, since it is larger than the sum of its proper divisors (4533783).

13540809 is a wasteful number, since it uses less digits than its factorization.

13540809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5047.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 13540809 is about 3679.7838251723. The cubic root of 13540809 is about 238.3498432931.

The spelling of 13540809 in words is "thirteen million, five hundred forty thousand, eight hundred nine".