13640809 has 8 divisors (see below), whose sum is σ = 16788800. Its totient is φ = 10792656.

The previous prime is 13640807. The next prime is 13640813. The reversal of 13640809 is 90804631.

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

It is not a de Polignac number, because 13640809 - 2¹ = 13640807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13640807) 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, 74859 + ... + 75040.

It is an arithmetic number, because the mean of its divisors is an integer number (2098600).

Almost surely, 2^13640809 is an apocalyptic number.

It is an amenable number.

13640809 is a deficient number, since it is larger than the sum of its proper divisors (3147991).

13640809 is a wasteful number, since it uses less digits than its factorization.

13640809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149919.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 13640809 is about 3693.3465854155. The cubic root of 13640809 is about 238.9351492729.

The spelling of 13640809 in words is "thirteen million, six hundred forty thousand, eight hundred nine".